Added: German, French + Dutch language files
Changed: Made integrated placeholders more efficient behind the scenes

Please note that the legacy (messages.yml) file will still be used by the plugin if it exists, so people have time to update to the new system. Support for the legacy file will be removed in a future update. Make sure you transfer your messages from the "messages.yml" file to your chosen language file ("lang_en", "lang_es", etc).