Update Config.java

src/main/java/emu/grasscutter/Config.java

 package emu.grasscutter;
 
+import java.util.Locale;
 import emu.grasscutter.Grasscutter.ServerDebugMode;
 import emu.grasscutter.Grasscutter.ServerRunMode;
 import emu.grasscutter.game.mail.Mail;
@@ -22,7 +23,7 @@ public final class Config {
 	public ServerRunMode RunMode = ServerRunMode.HYBRID; // HYBRID, DISPATCH_ONLY, GAME_ONLY
 	public GameServerOptions GameServer = new GameServerOptions();
 	public DispatchServerOptions DispatchServer = new DispatchServerOptions();
-	public String Language = "en_us";
+	public Locale LocaleLanguage = Locale.getDefault();
 
 	public Boolean OpenStamina = true;
 	public GameServerOptions getGameServerOptions() {