The only person I know for sure is Ammie (who runs fe-according-to-japan over at tumblr) but she doesn't do translations (especially large scale projects) unless she's personally interested in them. She also helped iron out a lot of Project Naga and has a lot of stuff in her DW journal, so you'll probably just get redirected over there.

Otherwise I dunno. I don't really trust a lot of the "translators" in the Jugdral fandom and the ones that I do are (mostly) already connected to Project Naga. The others aren't really into FE4 and probably would have no interest in a project surrounding it, sorry.