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How would one go about adding a different language with this mod?

You need to translate the included files and the edit to the language/en/common.php

Alright, but then how do I activate it? I have already included the files, but it doesn't seem to want to work.

Upload the translated files to your language mods folder.

Ok I see what you mean now, that's actually not so difficult. Anyways thanks for your help!