Yo, I don't know where i can ask it so post my question here. Is he going to be a french patch ? If no then can i make a translate in my files without get ban by the game ?

Well I'll explain the reason. Gui things in the client such as options/settings can be done via the client, however the translation of npcs would require months of work to translate. Also if we translated the npcs to French, we would have to also translate to German, Cantonese, Spanish, Portuguese, Hindi, and Klingon which is just not feasable. I hope this answers you a little bit better.