Board Thread:Wiki/Forum Technical Support/@comment-26383092-20151119145433/@comment-27723099-20151231154631

No, you have to insert the language file where you took the english file from. Open the mod file with an unzip tool, go to assets/lotr/lang, then paste your translation in that directory. After running Minecraft, the mod will create the file in the LOTR_UpdatedLang folder.