Error to Delete Language

I wish to engage in the learning process without this hinderance, I ran in to an error after an accident took place where I got 7500 coins for words I did not possess intent to mark as known, I am trying to delete a German language section, although when I delete the language it comes back.

Error put 7500 coins on my account and made unknown words known, when I try to delete the language in order to start fresh it returns.