Add multilingual support

Add multilingual support

src/main/java/emu/grasscutter/server/dispatch/authentication/DefaultAuthenticationHandler.java

@@ -52,21 +52,21 @@ public class DefaultAuthenticationHandler implements AuthenticationHandler {
                     responseData.data.account.email = account.getEmail();
 
                     Grasscutter.getLogger()
-                            .info(String.format("[Dispatch] Client %s failed to log in: Account %s created",
+                            .info(String.format(Grasscutter.getLanguage().Client_failed_login_account_create,
                                     req.ip(), responseData.data.account.uid));
                 } else {
                     responseData.retcode = -201;
-                    responseData.message = "Username not found, create failed.";
+                    responseData.message = Grasscutter.getLanguage().Username_not_found_create_failed;
 
-                    Grasscutter.getLogger().info(String.format(
-                            "[Dispatch] Client %s failed to log in: Account create failed", req.ip()));
+                    Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_failed_login_account_create_failed
+                            , req.ip()));
                 }
             } else {
                 responseData.retcode = -201;
-                responseData.message = "Username not found.";
+                responseData.message = Grasscutter.getLanguage().Username_not_found;
 
                 Grasscutter.getLogger().info(String
-                        .format("[Dispatch] Client %s failed to log in: Account no found", req.ip()));
+                        .format(Grasscutter.getLanguage().Client_failed_login_account_no_found, req.ip()));
             }
         } else {
             // Account was found, log the player in
@@ -75,7 +75,7 @@ public class DefaultAuthenticationHandler implements AuthenticationHandler {
             responseData.data.account.token = account.generateSessionKey();
             responseData.data.account.email = account.getEmail();
 
-            Grasscutter.getLogger().info(String.format("[Dispatch] Client %s logged in as %s", req.ip(),
+            Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_login, req.ip(),
                     responseData.data.account.uid));
         }
 

src/main/java/emu/grasscutter/server/game/GameServer.java

@@ -72,7 +72,7 @@ public final class GameServer extends KcpServer {
 				try {
 					onTick();
 				} catch (Exception e) {
-					Grasscutter.getLogger().error("An error occurred during game update.", e);
+					Grasscutter.getLogger().error(Grasscutter.getLanguage().An_error_occurred_during_game_update, e);
 				}
 			}
 		}, new Date(), 1000L);
@@ -207,8 +207,8 @@ public final class GameServer extends KcpServer {
 
 	@Override
 	public void onStartFinish() {
-		Grasscutter.getLogger().info("Grasscutter is FREE software. If you have paid for this, you may have been scammed. Homepage: https://github.com/Grasscutters/Grasscutter");
-		Grasscutter.getLogger().info("Game Server started on port " + address.getPort());
+		Grasscutter.getLogger().info(Grasscutter.getLanguage().grasscutter_is_free);
+		Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Game_start_port, address.getPort()));
 		ServerStartEvent event = new ServerStartEvent(ServerEvent.Type.GAME, OffsetDateTime.now()); event.call();
 	}
 	

src/main/java/emu/grasscutter/server/game/GameSession.java

@@ -113,12 +113,12 @@ public class GameSession extends KcpChannel {
 	
 	@Override
 	protected void onConnect() {
-		Grasscutter.getLogger().info("Client connected from " + getAddress().getHostString().toLowerCase());
+		Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_connect, getAddress().getHostString().toLowerCase()));
 	}
 
 	@Override
 	protected synchronized void onDisconnect() { // Synchronize so we dont add character at the same time
-		Grasscutter.getLogger().info("Client disconnected from " + getAddress().getHostString().toLowerCase());
+		Grasscutter.getLogger().info(String.format(Grasscutter.getLanguage().Client_disconnect, getAddress().getHostString().toLowerCase()));
 
 		// Set state so no more packets can be handled
 		this.setState(SessionState.INACTIVE);