Add multilingual support

Add multilingual support

src/main/java/emu/grasscutter/command/commands/KillCharacterCommand.java

@@ -25,11 +25,11 @@ public final class KillCharacterCommand implements CommandHandler {
                 try {
                     target = Integer.parseInt(args.get(0));
                 } catch (NumberFormatException e) {
-                    CommandHandler.sendMessage(null, "Invalid player id.");
+                    CommandHandler.sendMessage(null, Grasscutter.getLanguage().Invalid_playerId);
                     return;
                 }
             } else {
-                CommandHandler.sendMessage(null, "Usage: /killcharacter [playerId]");
+                CommandHandler.sendMessage(null, Grasscutter.getLanguage().KillCharacter_usage);
                 return;
             }
         } else {
@@ -40,7 +40,7 @@ public final class KillCharacterCommand implements CommandHandler {
                         target = sender.getUid();
                     }
                 } catch (NumberFormatException e) {
-                    CommandHandler.sendMessage(sender, "Invalid player id.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_playerId);
                     return;
                 }
             } else {
@@ -50,7 +50,7 @@ public final class KillCharacterCommand implements CommandHandler {
 
         Player targetPlayer = Grasscutter.getGameServer().getPlayerByUid(target);
         if (targetPlayer == null) {
-            CommandHandler.sendMessage(sender, "Player not found or offline.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Player_not_found_or_offline);
             return;
         }
 
@@ -63,6 +63,6 @@ public final class KillCharacterCommand implements CommandHandler {
         targetPlayer.getScene().removeEntity(entity);
         entity.onDeath(0);
 
-        CommandHandler.sendMessage(sender, "Killed " + targetPlayer.getNickname() + " current character.");
+        CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().KillCharacter_kill_current_character, targetPlayer.getNickname()));
     }
 }

src/main/java/emu/grasscutter/command/commands/ListCommand.java

@@ -21,7 +21,7 @@ public final class ListCommand implements CommandHandler {
             needUID = args.get(0).equals("uid");
         }
 
-        CommandHandler.sendMessage(sender, String.format("There are %s player(s) online:", playersMap.size()));
+        CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().List_message, playersMap.size()));
 
         if (playersMap.size() != 0) {
             StringBuilder playerSet = new StringBuilder();

src/main/java/emu/grasscutter/command/commands/PermissionCommand.java

@@ -15,7 +15,7 @@ public final class PermissionCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (args.size() < 3) {
-            CommandHandler.sendMessage(sender, "Usage: permission <add|remove> <username> <permission>");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Permission_usage);
             return;
         }
 
@@ -25,23 +25,23 @@ public final class PermissionCommand implements CommandHandler {
 
         Account account = Grasscutter.getGameServer().getAccountByName(username);
         if (account == null) {
-            CommandHandler.sendMessage(sender, "Account not found.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Account_not_find);
             return;
         }
 
         switch (action) {
             default:
-                CommandHandler.sendMessage(sender, "Usage: permission <add|remove> <username> <permission>");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Permission_usage);
                 break;
             case "add":
                 if (account.addPermission(permission)) {
-                    CommandHandler.sendMessage(sender, "Permission added.");
-                } else CommandHandler.sendMessage(sender, "They already have this permission!");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Permission_add);
+                } else CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Permission_have_permission);
                 break;
             case "remove":
                 if (account.removePermission(permission)) {
-                    CommandHandler.sendMessage(sender, "Permission removed.");
-                } else CommandHandler.sendMessage(sender, "They don't have this permission!");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Permission_remove);
+                } else CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Permission_not_have_permission);
                 break;
         }
 

src/main/java/emu/grasscutter/command/commands/PositionCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.game.player.Player;
@@ -13,11 +14,11 @@ public final class PositionCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
-        sender.dropMessage(String.format("Coord: %.3f, %.3f, %.3f\nScene id: %d",
+        sender.dropMessage(String.format(Grasscutter.getLanguage().Position_message,
                 sender.getPos().getX(), sender.getPos().getY(), sender.getPos().getZ(), sender.getSceneId()));
     }
 }

src/main/java/emu/grasscutter/command/commands/ReloadCommand.java

@@ -13,12 +13,13 @@ public final class ReloadCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, List<String> args) {
-        CommandHandler.sendMessage(sender, "Reloading config.");
+        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Reload_reload_start);
         Grasscutter.loadConfig();
+        Grasscutter.loadLanguage();
         Grasscutter.getGameServer().getGachaManager().load();
         Grasscutter.getGameServer().getDropManager().load();
         Grasscutter.getGameServer().getShopManager().load();
         Grasscutter.getDispatchServer().loadQueries();
-        CommandHandler.sendMessage(sender, "Reload complete.");
+        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Reload_reload_done);
     }
 }

src/main/java/emu/grasscutter/command/commands/ResetConstCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.game.avatar.Avatar;
@@ -16,13 +17,13 @@ public final class ResetConstCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
         if (args.size() > 0 && args.get(0).equalsIgnoreCase("all")) {
             sender.getAvatars().forEach(this::resetConstellation);
-            sender.dropMessage("Reset all avatars' constellations.");
+            sender.dropMessage(Grasscutter.getLanguage().ResetConst_reset_all);
         } else {
             EntityAvatar entity = sender.getTeamManager().getCurrentAvatarEntity();
             if (entity == null) {
@@ -32,7 +33,7 @@ public final class ResetConstCommand implements CommandHandler {
             Avatar avatar = entity.getAvatar();
             this.resetConstellation(avatar);
 
-            sender.dropMessage("Constellations for " + avatar.getAvatarData().getName() + " have been reset. Please relog to see changes.");
+            sender.dropMessage(String.format(Grasscutter.getLanguage().ResetConst_reset_all_done, avatar.getAvatarData().getName()));
         }
     }
 

src/main/java/emu/grasscutter/command/commands/ResetShopLimitCommand.java

@@ -13,19 +13,19 @@ public final class ResetShopLimitCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (args.size() < 1) {
-            CommandHandler.sendMessage(sender,"Usage: /resetshop <player id>");
+            CommandHandler.sendMessage(sender,Grasscutter.getLanguage().ResetShopLimit_usage);
             return;
         }
 
         int target = Integer.parseInt(args.get(0));
         Player targetPlayer = Grasscutter.getGameServer().getPlayerByUid(target);
         if (targetPlayer == null) {
-            CommandHandler.sendMessage(sender, "Player not found.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Player_not_found);
             return;
         }
 
         targetPlayer.getShopLimit().forEach(x -> x.setNextRefreshTime(0));
         targetPlayer.save();
-        CommandHandler.sendMessage(sender, "Success");
+        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Success);
     }
 }

src/main/java/emu/grasscutter/command/commands/SendMailCommand.java

@@ -45,16 +45,16 @@ public final class SendMailCommand implements CommandHandler {
                             if (DatabaseHelper.getPlayerById(Integer.parseInt(args.get(0))) != null) {
                                 mailBuilder = new MailBuilder(Integer.parseInt(args.get(0)), new Mail());
                             } else {
-                                CommandHandler.sendMessage(sender, "The user with an id of '" + args.get(0) + "' does not exist");
+                                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_user_not_exist, args.get(0)));
                                 return;
                             }
                         }
                     }
                     mailBeingConstructed.put(senderId, mailBuilder);
-                    CommandHandler.sendMessage(sender, "Starting composition of message.\nPlease use `/sendmail <title>` to continue.\nYou can use `/sendmail stop` at any time");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SendMail_start_composition);
                 }
-                case 2 -> CommandHandler.sendMessage(sender, "Mail templates coming soon implemented...");
-                default -> CommandHandler.sendMessage(sender, "Invalid arguments.\nUsage `/sendmail <userId|all|help> [templateId]`");
+                case 2 -> CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SendMail_templates);
+                default -> CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SendMail_invalid_arguments);
             }
         } else {
             MailBuilder mailBuilder = mailBeingConstructed.get(senderId);
@@ -63,28 +63,28 @@ public final class SendMailCommand implements CommandHandler {
                 switch (args.get(0).toLowerCase()) {
                     case "stop" -> {
                         mailBeingConstructed.remove(senderId);
-                        CommandHandler.sendMessage(sender, "Message sending cancelled");
+                        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SendMail_send_cancel);
                         return;
                     }
                     case "finish" -> {
                         if (mailBuilder.constructionStage == 3) {
                             if (!mailBuilder.sendToAll) {
                                 Grasscutter.getGameServer().getPlayerByUid(mailBuilder.recipient, true).sendMail(mailBuilder.mail);
-                                CommandHandler.sendMessage(sender, "Message sent to user " + mailBuilder.recipient + "!");
+                                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_send_done, mailBuilder.recipient));
                             } else {
                                 for (Player player : DatabaseHelper.getAllPlayers()) {
                                     Grasscutter.getGameServer().getPlayerByUid(player.getUid(), true).sendMail(mailBuilder.mail);
                                 }
-                                CommandHandler.sendMessage(sender, "Message sent to all users!");
+                                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SendMail_send_all_done);
                             }
                             mailBeingConstructed.remove(senderId);
                         } else {
-                            CommandHandler.sendMessage(sender, "Message composition not at final stage.\nPlease use `/sendmail " + getConstructionArgs(mailBuilder.constructionStage) + "` or `/sendmail stop` to cancel");
+                            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_not_composition_end, getConstructionArgs(mailBuilder.constructionStage)));
                         }
                         return;
                     }
                     case "help" -> {
-                        CommandHandler.sendMessage(sender, "Please use `/sendmail " + getConstructionArgs(mailBuilder.constructionStage) + "`");
+                        CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_Please_use, getConstructionArgs(mailBuilder.constructionStage)));
                         return;
                     }
                     default -> {
@@ -92,19 +92,19 @@ public final class SendMailCommand implements CommandHandler {
                             case 0 -> {
                                 String title = String.join(" ", args.subList(0, args.size()));
                                 mailBuilder.mail.mailContent.title = title;
-                                CommandHandler.sendMessage(sender, "Message title set as '" + title + "'.\nUse '/sendmail <content>' to continue.");
+                                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_set_title, title));
                                 mailBuilder.constructionStage++;
                             }
                             case 1 -> {
                                 String contents = String.join(" ", args.subList(0, args.size()));
                                 mailBuilder.mail.mailContent.content = contents;
-                                CommandHandler.sendMessage(sender, "Message contents set as '" + contents + "'.\nUse '/sendmail <sender>' to continue.");
+                                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_set_contents, contents));
                                 mailBuilder.constructionStage++;
                             }
                             case 2 -> {
                                 String msgSender = String.join(" ", args.subList(0, args.size()));
                                 mailBuilder.mail.mailContent.sender = msgSender;
-                                CommandHandler.sendMessage(sender, "Message sender set as '" + msgSender + "'.\nUse '/sendmail <itemId|itemName|finish> [amount] [level]' to continue.");
+                                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_set_message_sender, msgSender));
                                 mailBuilder.constructionStage++;
                             }
                             case 3 -> {
@@ -112,7 +112,7 @@ public final class SendMailCommand implements CommandHandler {
                                 int item, lvl, amount = 1;
                                 switch (args.size()) {
                                     default -> { // *No args*
-                                        CommandHandler.sendMessage(sender, "Usage: give [player] <itemId|itemName> [amount]");
+                                        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SendMail_usage);
                                         return;
                                     }
                                     case 1 -> { // <itemId|itemName>
@@ -121,7 +121,7 @@ public final class SendMailCommand implements CommandHandler {
                                             lvl = 1;
                                         } catch (NumberFormatException ignored) {
                                             // TODO: Parse from item name using GM Handbook.
-                                            CommandHandler.sendMessage(sender, "Invalid item id.");
+                                            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_item_id);
                                             return;
                                         }
                                     }
@@ -138,19 +138,19 @@ public final class SendMailCommand implements CommandHandler {
 
                                         } catch (NumberFormatException ignored) {
                                             // TODO: Parse from item name using GM Handbook.
-                                            CommandHandler.sendMessage(sender, "Invalid item or player ID.");
+                                            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_item_or_player_id);
                                             return;
                                         }
                                     }
                                 }
                                 mailBuilder.mail.itemList.add(new Mail.MailItem(item, amount, lvl));
-                                CommandHandler.sendMessage(sender, String.format("Attached %s of %s (level %s) to the message.\nContinue adding more items or use `/sendmail finish` to send the message.", amount, item, lvl));
+                                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_send, amount, item, lvl));
                             }
                         }
                     }
                 }
             } else {
-                CommandHandler.sendMessage(sender, "Invalid arguments \n Please use `/sendmail " + getConstructionArgs(mailBuilder.constructionStage));
+                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SendMail_invalid_arguments_please_use, getConstructionArgs(mailBuilder.constructionStage)));
             }
         }
     }
@@ -158,21 +158,21 @@ public final class SendMailCommand implements CommandHandler {
     private String getConstructionArgs(int stage) {
         switch (stage) {
             case 0 -> {
-                return "<title>";
+                return Grasscutter.getLanguage().SendMail_title;
             }
             case 1 -> {
-                return "<message>";
+                return Grasscutter.getLanguage().SendMail_message;
             }
             case 2 -> {
-                return "<sender>";
+                return Grasscutter.getLanguage().SendMail_sender;
 
             }
             case 3 -> {
-                return "<itemId|itemName|finish> [amount] [level]";
+                return Grasscutter.getLanguage().SendMail_arguments;
             }
             default -> {
                 Thread.dumpStack();
-                return "ERROR: invalid construction stage " + stage + ". Check console for stacktrace.";
+                return String.format(Grasscutter.getLanguage().SendMail_error, stage);
             }
         }
     }

src/main/java/emu/grasscutter/command/commands/SendMessageCommand.java

@@ -14,7 +14,7 @@ public final class SendMessageCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (args.size() < 2) {
-            CommandHandler.sendMessage(null, "Usage: sendmessage <player> <message>");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().SendMessage_usage);
             return;
         }
 
@@ -24,14 +24,14 @@ public final class SendMessageCommand implements CommandHandler {
 
             Player targetPlayer = Grasscutter.getGameServer().getPlayerByUid(target);
             if (targetPlayer == null) {
-                CommandHandler.sendMessage(sender, "Player not found.");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Player_not_found);
                 return;
             }
 
             CommandHandler.sendMessage(targetPlayer, message);
-            CommandHandler.sendMessage(sender, "Message sent.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SenaMessage_message_sent);
         } catch (NumberFormatException ignored) {
-            CommandHandler.sendMessage(sender, "Invalid player ID.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_playerId);
         }
     }
 }
\ No newline at end of file

src/main/java/emu/grasscutter/command/commands/SetFetterLevelCommand.java

@@ -2,6 +2,7 @@ package emu.grasscutter.command.commands;
 
 import java.util.List;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.data.GameData;
@@ -17,19 +18,19 @@ public final class SetFetterLevelCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
         if (args.size() < 1) {
-            CommandHandler.sendMessage(sender, "Usage: setfetterlevel <level>");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetFetterLevel_usage);
             return;
         }
 
         try {
             int fetterLevel = Integer.parseInt(args.get(0));
             if (fetterLevel < 0 || fetterLevel > 10) {
-                CommandHandler.sendMessage(sender, "Fetter level must be between 0 and 10.");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetFetterLevel_fetter_level_must_between_0_and_10);
                 return;
             }
             Avatar avatar = sender.getTeamManager().getCurrentAvatarEntity().getAvatar();
@@ -41,9 +42,9 @@ public final class SetFetterLevelCommand implements CommandHandler {
 		    avatar.save();
 		
 		    sender.sendPacket(new PacketAvatarFetterDataNotify(avatar));
-            CommandHandler.sendMessage(sender, "Fetter level set to " + fetterLevel);
+            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetFetterLevel_fetter_set_level, fetterLevel));
         } catch (NumberFormatException ignored) {
-            CommandHandler.sendMessage(sender, "Invalid fetter level.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetFetterLevel_invalid_fetter_level);
         }
     }
     

src/main/java/emu/grasscutter/command/commands/SetStatsCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.game.entity.EntityAvatar;
@@ -16,20 +17,20 @@ public final class SetStatsCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
         if (args.size() < 2){
-            CommandHandler.sendMessage(sender, "Usage: setstats|stats <stat> <value>");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_usage);
             return;
         }
 
         String stat = args.get(0);
         switch (stat) {
             default:
-                CommandHandler.sendMessage(sender, "Usage: /setstats|stats <hp | mhp | def | atk | em | er | crate | cdmg> <value> for basic stats");
-                CommandHandler.sendMessage(sender, "Usage: /stats <epyro | ecryo | ehydro | egeo | edend | eelec | ephys> <amount> for elemental bonus");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_setstats_help_message);
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_stats_help_message);
                 return;
             case "mhp":
                 try {
@@ -37,9 +38,9 @@ public final class SetStatsCommand implements CommandHandler {
                     EntityAvatar entity = sender.getTeamManager().getCurrentAvatarEntity();
                     entity.setFightProperty(FightProperty.FIGHT_PROP_MAX_HP, health);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_MAX_HP));
-                    CommandHandler.sendMessage(sender, "MAX HP set to " + health + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_max_hp, health));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Max HP value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_max_hp_error);
                     return;
                 }
                 break;
@@ -49,9 +50,9 @@ public final class SetStatsCommand implements CommandHandler {
                     EntityAvatar entity = sender.getTeamManager().getCurrentAvatarEntity();
                     entity.setFightProperty(FightProperty.FIGHT_PROP_CUR_HP, health);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CUR_HP));
-                    CommandHandler.sendMessage(sender, "HP set to " + health + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_hp, health));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid HP value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_hp_error);
                     return;
                 }
                 break;
@@ -61,9 +62,9 @@ public final class SetStatsCommand implements CommandHandler {
                     EntityAvatar entity = sender.getTeamManager().getCurrentAvatarEntity();
                     entity.setFightProperty(FightProperty.FIGHT_PROP_CUR_DEFENSE, def);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CUR_DEFENSE));
-                    CommandHandler.sendMessage(sender, "DEF set to " + def + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_def, def));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid DEF value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_def_error);
                     return;
                 }
                 break;
@@ -73,9 +74,9 @@ public final class SetStatsCommand implements CommandHandler {
                     EntityAvatar entity = sender.getTeamManager().getCurrentAvatarEntity();
                     entity.setFightProperty(FightProperty.FIGHT_PROP_CUR_ATTACK, atk);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CUR_ATTACK));
-                    CommandHandler.sendMessage(sender, "ATK set to " + atk + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_atk, atk));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid ATK value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_atk_error);
                     return;
                 }
                 break;
@@ -85,9 +86,9 @@ public final class SetStatsCommand implements CommandHandler {
                     EntityAvatar entity = sender.getTeamManager().getCurrentAvatarEntity();
                     entity.setFightProperty(FightProperty.FIGHT_PROP_ELEMENT_MASTERY, em);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_ELEMENT_MASTERY));
-                    CommandHandler.sendMessage(sender, "Elemental Mastery set to " + em + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_em, em));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid EM value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_em_error);
                     return;
                 }
                 break;
@@ -99,9 +100,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_CHARGE_EFFICIENCY, erecharge);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CHARGE_EFFICIENCY));
                     float iger = erecharge * 100;
-                    CommandHandler.sendMessage(sender, "Energy recharge set to " + iger + "%.");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_er, iger));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid ER value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_er_error);
                     return;
                 }
                 break;
@@ -113,9 +114,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_CRITICAL, crate);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CRITICAL));
                     float igcrate = crate * 100;
-                    CommandHandler.sendMessage(sender, "Crit Rate set to " + igcrate + "%.");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_cr, igcrate));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Crit Rate value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_cr_error);
                     return;
                 }
                 break;
@@ -127,9 +128,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_CRITICAL_HURT, cdamage);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_CRITICAL_HURT));
                     float igcdmg = cdamage * 100;
-                    CommandHandler.sendMessage(sender, "Crit DMG set to " + igcdmg + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_cd, igcdmg));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Crit DMG value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_cd_error);
                     return;
                 }
                 break;
@@ -141,9 +142,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_FIRE_ADD_HURT, pyro);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_FIRE_ADD_HURT));
                     float igpyro = pyro * 100;
-                    CommandHandler.sendMessage(sender, "Pyro DMG Bonus set to " + igpyro + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_pdb, igpyro));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Pyro DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_pdb_error);
                     return;
                 }
                 break;
@@ -155,9 +156,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_ICE_ADD_HURT, cryo);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_ICE_ADD_HURT));
                     float igcyro = cryo * 100;
-                    CommandHandler.sendMessage(sender, "Cyro DMG Bonus set to " + igcyro + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_cdb, igcyro));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Cryo DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_cdb_error);
                     return;
                 }
                 break;
@@ -169,9 +170,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_WATER_ADD_HURT, hydro);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_WATER_ADD_HURT));
                     float ighydro = hydro * 100;
-                    CommandHandler.sendMessage(sender, "Hydro DMG Bonus set to " + ighydro + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_hdb, ighydro));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Hydro DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_hdb_error);
                     return;
                 }
                 break;
@@ -183,9 +184,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_WIND_ADD_HURT, anemo);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_WIND_ADD_HURT));
                     float iganemo = anemo * 100;
-                    CommandHandler.sendMessage(sender, "Anemo DMG Bonus set to " + iganemo + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_adb, iganemo));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Anemo DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_adb_error);
                     return;
                 }
                 break;
@@ -197,9 +198,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_ROCK_ADD_HURT, geo);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_ROCK_ADD_HURT));
                     float iggeo = geo * 100;
-                    CommandHandler.sendMessage(sender, "Geo DMG Bonus set to " + iggeo + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_gdb, iggeo));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Geo DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_gdb_error);
                     return;
                 }
                 break;
@@ -212,9 +213,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_ELEC_ADD_HURT, elec);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_ELEC_ADD_HURT));
                     float igelec = elec * 100;
-                    CommandHandler.sendMessage(sender, "Electro DMG Bonus set to " + igelec + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_edb, igelec));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Electro DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_edb_error);
                     return;
                 }
                 break;
@@ -226,9 +227,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_PHYSICAL_ADD_HURT, phys);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_PHYSICAL_ADD_HURT));
                     float igphys = phys * 100;
-                    CommandHandler.sendMessage(sender, "Physical DMG Bonus set to " + igphys + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_physdb, igphys));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Physical DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_physdb_error);
                     return;
                 }
                 break;
@@ -240,9 +241,9 @@ public final class SetStatsCommand implements CommandHandler {
                     entity.setFightProperty(FightProperty.FIGHT_PROP_GRASS_ADD_HURT, dend);
                     entity.getWorld().broadcastPacket(new PacketEntityFightPropUpdateNotify(entity, FightProperty.FIGHT_PROP_GRASS_ADD_HURT));
                     float igdend = dend * 100;
-                    CommandHandler.sendMessage(sender, "Dendro DMG Bonus set to " + igdend + "%");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().SetStats_set_ddb, igdend));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid Dendro DMG Bonus value.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetStats_set_ddb_error);
                     return;
                 }
                 break;

src/main/java/emu/grasscutter/command/commands/SetWorldLevelCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.game.player.Player;
@@ -14,19 +15,19 @@ public final class SetWorldLevelCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return; // TODO: set player's world level from console or other players
         }
 
         if (args.size() < 1) {
-            CommandHandler.sendMessage(sender, "Usage: setworldlevel <level>");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().SetWorldLevel_usage);
             return;
         }
 
         try {
             int level = Integer.parseInt(args.get(0));
             if (level > 8 || level < 0) {
-                sender.dropMessage("World level must be between 0-8");
+                sender.dropMessage(Grasscutter.getLanguage().SetWorldLevel_world_level_must_between_0_and_8);
                 return;
             }
 
@@ -34,9 +35,9 @@ public final class SetWorldLevelCommand implements CommandHandler {
             sender.getWorld().setWorldLevel(level);
             sender.setWorldLevel(level);
 
-            sender.dropMessage("World level set to " + level + ".");
+            sender.dropMessage(String.format(Grasscutter.getLanguage().SetWorldLevel_set_world_level, level));
         } catch (NumberFormatException ignored) {
-            CommandHandler.sendMessage(null, "Invalid world level.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().SetWorldLevel_invalid_world_level);
         }
     }
 }

src/main/java/emu/grasscutter/command/commands/SpawnCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.data.GameData;
@@ -25,12 +26,12 @@ public final class SpawnCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
         if (args.size() < 1) {
-            CommandHandler.sendMessage(sender, "Usage: spawn <entityId> [amount] [level(monster only)]");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Spawn_usage);
             return;
         }
 
@@ -43,7 +44,7 @@ public final class SpawnCommand implements CommandHandler {
             GadgetData gadgetData = GameData.getGadgetDataMap().get(id);
             ItemData itemData = GameData.getItemDataMap().get(id);
             if (monsterData == null && gadgetData == null && itemData == null) {
-                CommandHandler.sendMessage(sender, "Invalid entity id.");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_entity_id);
                 return;
             }
 
@@ -78,9 +79,9 @@ public final class SpawnCommand implements CommandHandler {
 
                 sender.getScene().addEntity(entity);
             }
-            CommandHandler.sendMessage(sender, String.format("Spawned %s of %s.", amount, id));
+            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Spawn_message, amount, id));
         } catch (NumberFormatException ignored) {
-            CommandHandler.sendMessage(sender, "Invalid entity ID.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_entity_id);
         }
     }
 

src/main/java/emu/grasscutter/command/commands/StopCommand.java

@@ -13,9 +13,9 @@ public final class StopCommand implements CommandHandler {
 
     @Override
     public void execute(Player sender, List<String> args) {
-        CommandHandler.sendMessage(null, "Server shutting down...");
+        CommandHandler.sendMessage(null, Grasscutter.getLanguage().Stop_message);
         for (Player p : Grasscutter.getGameServer().getPlayers().values()) {
-            CommandHandler.sendMessage(p, "Server shutting down...");
+            CommandHandler.sendMessage(p, Grasscutter.getLanguage().Stop_message);
         }
 
         System.exit(1);

src/main/java/emu/grasscutter/command/commands/TalentCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.data.def.AvatarSkillDepotData;
@@ -18,23 +19,23 @@ public final class TalentCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
         if (args.size() < 1){
-            CommandHandler.sendMessage(sender, "To set talent level: /talent set <talentID> <value>");
-            CommandHandler.sendMessage(sender, "Another way to set talent level: /talent <n or e or q> <value>");
-            CommandHandler.sendMessage(sender, "To get talent ID: /talent getid");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_1);
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_2);
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_3);
             return;
         }
 
         String cmdSwitch = args.get(0);
         switch (cmdSwitch) {
             default:
-                CommandHandler.sendMessage(sender, "To set talent level: /talent set <talentID> <value>");
-                CommandHandler.sendMessage(sender, "Another way to set talent level: /talent <n or e or q> <value>");
-                CommandHandler.sendMessage(sender, "To get talent ID: /talent getid");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_1);
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_2);
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_3);
             return;
             case "set":
                     try {
@@ -49,12 +50,12 @@ public final class TalentCommand implements CommandHandler {
                         int currentLevelE = avatar.getSkillLevelMap().get(skillIdE);
                         int currentLevelQ = avatar.getSkillLevelMap().get(skillIdQ);
                         if (args.size() < 2){
-                            CommandHandler.sendMessage(sender, "To set talent level: /talent set <talentID> <value>");
-                            CommandHandler.sendMessage(sender, "To get talent ID: /talent getid");
+                            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_1);
+                            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_3);
                             return;
                         }
                         if (nextLevel >= 16){ 
-                            CommandHandler.sendMessage(sender, "Invalid talent level. Level should be lower than 16");
+                            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_lower_16);
                             return;
                         }
                             if (skillId == skillIdNorAtk){ 
@@ -65,7 +66,7 @@ public final class TalentCommand implements CommandHandler {
                             // Packet
                             sender.sendPacket(new PacketAvatarSkillChangeNotify(avatar, skillIdNorAtk, currentLevelNorAtk, nextLevel));
                             sender.sendPacket(new PacketAvatarSkillUpgradeRsp(avatar, skillIdNorAtk, currentLevelNorAtk, nextLevel));
-                            CommandHandler.sendMessage(sender, "Set talent Normal ATK to " + nextLevel + ".");
+                            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_set_atk, nextLevel));
                         }    
                         if (skillId == skillIdE){ 
                             // Upgrade skill
@@ -75,7 +76,7 @@ public final class TalentCommand implements CommandHandler {
                             // Packet
                             sender.sendPacket(new PacketAvatarSkillChangeNotify(avatar, skillIdE, currentLevelE, nextLevel));
                             sender.sendPacket(new PacketAvatarSkillUpgradeRsp(avatar, skillIdE, currentLevelE, nextLevel));
-                            CommandHandler.sendMessage(sender, "Set talent E to " + nextLevel + ".");
+                            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_set_e, nextLevel));
                         }
                         if (skillId == skillIdQ){ 
                             // Upgrade skill
@@ -85,11 +86,11 @@ public final class TalentCommand implements CommandHandler {
                             // Packet
                             sender.sendPacket(new PacketAvatarSkillChangeNotify(avatar, skillIdQ, currentLevelQ, nextLevel));
                             sender.sendPacket(new PacketAvatarSkillUpgradeRsp(avatar, skillIdQ, currentLevelQ, nextLevel));
-                            CommandHandler.sendMessage(sender, "Set talent Q to " + nextLevel + ".");
+                            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_set_q, nextLevel));
                         }       
                                 
                     } catch (NumberFormatException ignored) {
-                        CommandHandler.sendMessage(sender, "Invalid skill ID.");
+                        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_invalid_skill_id);
                         return;
                     }
                 
@@ -114,11 +115,11 @@ public final class TalentCommand implements CommandHandler {
                     int nextLevel = Integer.parseInt(args.get(1));
                     int currentLevel = avatar.getSkillLevelMap().get(skillId);
                     if (args.size() < 1){
-                        CommandHandler.sendMessage(sender, "To set talent level: /talent <n or e or q> <value>");
+                        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_usage_2);
                         return;
                     }
                     if (nextLevel >= 16){
-                        CommandHandler.sendMessage(sender, "Invalid talent level. Level should be lower than 16");
+                        CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_lower_16);
                         return;
                     }
                     // Upgrade skill
@@ -127,9 +128,9 @@ public final class TalentCommand implements CommandHandler {
                     // Packet
                     sender.sendPacket(new PacketAvatarSkillChangeNotify(avatar, skillId, currentLevel, nextLevel));
                     sender.sendPacket(new PacketAvatarSkillUpgradeRsp(avatar, skillId, currentLevel, nextLevel));
-                    CommandHandler.sendMessage(sender, "Set this talent to " + nextLevel + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_set_this, nextLevel));
                 } catch (NumberFormatException ignored) {
-                    CommandHandler.sendMessage(sender, "Invalid talent level.");
+                    CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Talent_invalid_talent_level);
                     return;
                 }
                 break;
@@ -140,9 +141,9 @@ public final class TalentCommand implements CommandHandler {
                     int skillIdE = avatar.getData().getSkillDepot().getSkills().get(1);
                     int skillIdQ = avatar.getData().getSkillDepot().getEnergySkill();
                     
-                    CommandHandler.sendMessage(sender, "Normal Attack ID " + skillIdNorAtk + ".");
-                    CommandHandler.sendMessage(sender, "E skill ID " + skillIdE + ".");
-                    CommandHandler.sendMessage(sender, "Q skill ID " + skillIdQ + ".");
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_normal_attack_id, skillIdNorAtk));
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_e_skill_id, skillIdE));
+                    CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Talent_q_skill_id, skillIdQ));
                 break;
         }
     }

src/main/java/emu/grasscutter/command/commands/TeleportAllCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.game.player.Player;
@@ -13,12 +14,12 @@ public final class TeleportAllCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
         
         if (!sender.getWorld().isMultiplayer()) {
-            CommandHandler.sendMessage(sender, "You only can use this command in MP mode.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().TeleportAll_message);
             return;
         }
         

src/main/java/emu/grasscutter/command/commands/TeleportCommand.java

@@ -16,20 +16,20 @@ public final class TeleportCommand implements CommandHandler {
     public void execute(Player sender, List<String> args) {
         int target;
         if (args.size() < (sender == null ? 4 : 3)) {
-            CommandHandler.sendMessage(sender, sender == null ? "Usage: /tp @<player id> <x> <y> <z> [scene id]" :
-                    "Usage: /tp [@<player id>] <x> <y> <z> [scene id]");
+            CommandHandler.sendMessage(sender, sender == null ? Grasscutter.getLanguage().Teleport_usage_server :
+                    Grasscutter.getLanguage().Teleport_usage);
             return;
         }
         if (args.get(0).startsWith("@")) {
             try {
                 target = Integer.parseInt(args.get(0).substring(1));
             } catch (NumberFormatException e) {
-                CommandHandler.sendMessage(sender, "Invalid player id.");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Invalid_playerId);
                 return;
             }
         } else {
             if (sender == null) {
-                CommandHandler.sendMessage(null, "You must specify a player id.");
+                CommandHandler.sendMessage(null, Grasscutter.getLanguage().Teleport_specify_player_id);
                 return;
             }
             target = sender.getUid();
@@ -37,7 +37,7 @@ public final class TeleportCommand implements CommandHandler {
 
         Player targetPlayer = Grasscutter.getGameServer().getPlayerByUid(target);
         if (targetPlayer == null) {
-            CommandHandler.sendMessage(sender, "Player not found or offline.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Player_not_found_or_offline);
             return;
         }
         args = args.subList(args.get(0).startsWith("@") ? 1 : 0, args.size());
@@ -80,12 +80,12 @@ public final class TeleportCommand implements CommandHandler {
             Position target_pos = new Position(x, y, z);
             boolean result = targetPlayer.getWorld().transferPlayerToScene(targetPlayer, sceneId, target_pos);
             if (!result) {
-                CommandHandler.sendMessage(sender, "Invalid position.");
+                CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Teleport_invalid_position);
             } else {
-                CommandHandler.sendMessage(sender, "Teleported " + targetPlayer.getNickname() + " to " + x + "," + y + "," + z + " in scene " + sceneId);
+                CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Teleport_message, targetPlayer.getNickname(), x, y, z, sceneId));
             }
         } catch (NumberFormatException ignored) {
-            CommandHandler.sendMessage(sender, "Invalid position.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Teleport_invalid_position);
         }
     }
 }

src/main/java/emu/grasscutter/command/commands/WeatherCommand.java

 package emu.grasscutter.command.commands;
 
+import emu.grasscutter.Grasscutter;
 import emu.grasscutter.command.Command;
 import emu.grasscutter.command.CommandHandler;
 import emu.grasscutter.game.player.Player;
@@ -15,12 +16,12 @@ public final class WeatherCommand implements CommandHandler {
     @Override
     public void execute(Player sender, List<String> args) {
         if (sender == null) {
-            CommandHandler.sendMessage(null, "Run this command in-game.");
+            CommandHandler.sendMessage(null, Grasscutter.getLanguage().Run_this_command_in_game);
             return;
         }
 
         if (args.size() < 1) {
-            CommandHandler.sendMessage(sender, "Usage: weather <weatherId> [climateId]");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Weather_usage);
             return;
         }
 
@@ -33,9 +34,9 @@ public final class WeatherCommand implements CommandHandler {
             sender.getScene().setWeather(weatherId);
             sender.getScene().setClimate(climate);
             sender.getScene().broadcastPacket(new PacketSceneAreaWeatherNotify(sender));
-            CommandHandler.sendMessage(sender, "Changed weather to " + weatherId + " with climate " + climateId);
+            CommandHandler.sendMessage(sender, String.format(Grasscutter.getLanguage().Weather_message, weatherId, climateId));
         } catch (NumberFormatException ignored) {
-            CommandHandler.sendMessage(sender, "Invalid ID.");
+            CommandHandler.sendMessage(sender, Grasscutter.getLanguage().Weather_invalid_id);
         }
     }
 }

src/main/java/emu/grasscutter/server/dispatch/DispatchHttpJsonHandler.java

@@ -32,7 +32,7 @@ public final class DispatchHttpJsonHandler implements HttpContextHandler {
 	public void handle(Request req, Response res) throws IOException {
 		// Checking for ALL here isn't required as when ALL is enabled enableDevLogging() gets enabled
 		if(Grasscutter.getConfig().DebugMode == ServerDebugMode.MISSING && Arrays.stream(missingRoutes).anyMatch(x -> x == req.baseUrl())) {
-			Grasscutter.getLogger().info(String.format("[Dispatch] Client %s %s request: %s", req.ip(), req.method(), req.baseUrl()) + (Grasscutter.getConfig().DebugMode == ServerDebugMode.MISSING ? "(MISSING)" : ""));
+			Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_request, req.ip(), req.method(), req.baseUrl()) + (Grasscutter.getConfig().DebugMode == ServerDebugMode.MISSING ? "(MISSING)" : ""));
 		}
 		res.send(response);
 	}

src/main/java/emu/grasscutter/server/dispatch/DispatchServer.java

@@ -211,21 +211,21 @@ public final class DispatchServer {
 							sslContextFactory.setKeyStorePassword(Grasscutter.getConfig().getDispatchOptions().KeystorePassword);
 						} catch (Exception e) {
 							e.printStackTrace();
-							Grasscutter.getLogger().warn("[Dispatch] Unable to load keystore. Trying default keystore password...");
+							Grasscutter.getLogger().warn(Grasscutter.getLanguage().Not_load_keystore);
 
 							try {
 								sslContextFactory.setKeyStorePath(keystoreFile.getPath());
 								sslContextFactory.setKeyStorePassword("123456");
-								Grasscutter.getLogger().warn("[Dispatch] The default keystore password was loaded successfully. Please consider setting the password to 123456 in config.json.");
+								Grasscutter.getLogger().warn(Grasscutter.getLanguage().Use_default_keystore);
 							} catch (Exception e2) {
-								Grasscutter.getLogger().warn("[Dispatch] Error while loading keystore!");
+								Grasscutter.getLogger().warn(Grasscutter.getLanguage().Load_keystore_error);
 								e2.printStackTrace();
 							}
 						}
 
 						serverConnector = new ServerConnector(server, sslContextFactory);
 					} else {
-						Grasscutter.getLogger().warn("[Dispatch] No SSL cert found! Falling back to HTTP server.");
+						Grasscutter.getLogger().warn(Grasscutter.getLanguage().Not_find_ssl_cert);
 						Grasscutter.getConfig().getDispatchOptions().UseSSL = false;
 
 						serverConnector = new ServerConnector(server);
@@ -245,11 +245,11 @@ public final class DispatchServer {
 			}
 		});
 
-		httpServer.get("/", (req, res) -> res.send("Welcome to Grasscutter"));
+		httpServer.get("/", (req, res) -> res.send(Grasscutter.getLanguage().Welcome));
 
 		httpServer.raw().error(404, ctx -> {
 			if(Grasscutter.getConfig().DebugMode == ServerDebugMode.MISSING) {
-				Grasscutter.getLogger().info(String.format("[Dispatch] Potential unhandled %s request: %s", ctx.method(), ctx.url()));
+				Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Potential_unhandled_request, ctx.method(), ctx.url()));
 			}
 			ctx.contentType("text/html");
 			ctx.result("<!doctype html><html lang=\"en\"><body><img src=\"https://http.cat/404\" /></body></html>"); // I'm like 70% sure this won't break anything.
@@ -327,7 +327,7 @@ public final class DispatchServer {
 				return;
 			}
 			LoginResultJson responseData = new LoginResultJson();
-			Grasscutter.getLogger().info(String.format("[Dispatch] Client %s is trying to log in via token", req.ip()));
+			Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_login_token, req.ip()));
 
 			// Login
 			Account account = DatabaseHelper.getAccountById(requestData.uid);
@@ -335,17 +335,17 @@ public final class DispatchServer {
 			// Test
 			if (account == null || !account.getSessionKey().equals(requestData.token)) {
 				responseData.retcode = -111;
-				responseData.message = "Game account cache information error";
+				responseData.message = Grasscutter.getLanguage().Game_account_cache_error;
 
 				Grasscutter.getLogger()
-						.info(String.format("[Dispatch] Client %s failed to log in via token", req.ip()));
+						.info(String.format(Grasscutter.getLanguage().Client_token_login_failed, req.ip()));
 			} else {
 				responseData.message = "OK";
 				responseData.data.account.uid = requestData.uid;
 				responseData.data.account.token = requestData.token;
 				responseData.data.account.email = account.getEmail();
 
-				Grasscutter.getLogger().info(String.format("[Dispatch] Client %s logged in via token as %s",
+				Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_login_in_token,
 						req.ip(), responseData.data.account.uid));
 			}
 
@@ -376,10 +376,10 @@ public final class DispatchServer {
 			// Test
 			if (account == null || !account.getSessionKey().equals(loginData.token)) {
 				responseData.retcode = -201;
-				responseData.message = "Wrong session key.";
+				responseData.message = Grasscutter.getLanguage().Wrong_session_key;
 
 				Grasscutter.getLogger().info(
-						String.format("[Dispatch] Client %s failed to exchange combo token", req.ip()));
+						String.format(Grasscutter.getLanguage().Client_failed_exchange_combo_token, req.ip()));
 			} else {
 				responseData.message = "OK";
 				responseData.data.open_id = loginData.uid;
@@ -387,7 +387,7 @@ public final class DispatchServer {
 				responseData.data.combo_token = account.generateLoginToken();
 
 				Grasscutter.getLogger().info(
-						String.format("[Dispatch] Client %s succeed to exchange combo token", req.ip()));
+						String.format(Grasscutter.getLanguage().Client_exchange_combo_token, req.ip()));
 			}
 
 			res.send(responseData);
@@ -453,7 +453,7 @@ public final class DispatchServer {
 		httpServer.get("/gcstatic/*", new StaticFileHandler());
 
 		httpServer.listen(Grasscutter.getConfig().getDispatchOptions().Port);
-		Grasscutter.getLogger().info("[Dispatch] Dispatch server started on port " + httpServer.raw().port());
+		Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Dispatch_start_server_port, httpServer.raw().port()));
 	}
 
 	private Map<String, String> parseQueryString(String qs) {