Fix ConcurrentModificationException

Signed-off-by: Lixfel <agga-games@gmx.de>

src/de/steamwar/bungeecore/Message.java

@@ -74,7 +74,7 @@ public class Message {
     }
 
     private static ResourceBundle getResourceBundle(Locale locale) {
-        return bundles.computeIfAbsent(locale.toString(), locale1 -> getResourceBundle(locale.toString(), getResourceBundle(locale.getLanguage(), getResourceBundle( "", (ResourceBundle) null))));
+        return getResourceBundle(locale.toString(), getResourceBundle(locale.getLanguage(), getResourceBundle( "", (ResourceBundle) null)));
     }
 
     private static String parse(String message, boolean prefixed, Locale locale, Object... params){