fixed language not found prompt

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

@@ -44,6 +44,13 @@ public final class LanguageCommand implements CommandHandler {
             actualLangCode = languageInst.getLanguageCode();
             Grasscutter.setLanguage(languageInst);
         }
+
+        if (!langCode.equals(actualLangCode)) {
+            // I think there is no necessary to register this in language files
+            // since this will always be english
+            CommandHandler.sendMessage(sender, "currently, server does not have that language: " + langCode);
+        }
+
         CommandHandler.sendMessage(sender, translate(sender, "commands.language.language_changed", actualLangCode));
 
     }

src/main/java/emu/grasscutter/utils/Language.java

@@ -125,23 +125,23 @@ public final class Language {
         InputStream file = Grasscutter.class.getResourceAsStream("/languages/" + fileName);
 
         if (file == null) { // Provided fallback language.
+            Grasscutter.getLogger().warn("Failed to load language file: " + fileName + ", falling back to: " + fallback);
             actualLanguageCode = fallbackLanguageCode;
             if (cachedLanguages.containsKey(actualLanguageCode)) {
                 return new LanguageStreamDescription(actualLanguageCode, null);
             }
             
             file = Grasscutter.class.getResourceAsStream("/languages/" + fallback);
-            Grasscutter.getLogger().warn("Failed to load language file: " + fileName + ", falling back to: " + fallback);
         }
 
         if(file == null) { // Fallback the fallback language.
+            Grasscutter.getLogger().warn("Failed to load language file: " + fallback + ", falling back to: en-US.json");
             actualLanguageCode = "en-US";
             if (cachedLanguages.containsKey(actualLanguageCode)) {
                 return new LanguageStreamDescription(actualLanguageCode, null);
             }
             
             file = Grasscutter.class.getResourceAsStream("/languages/en-US.json");
-            Grasscutter.getLogger().warn("Failed to load language file: " + fallback + ", falling back to: en-US.json");
         }
 
         if(file == null)