I don't see the point. Just wait until the game comes out and the work has been done by professionals. That just makes your work meaningless, since it's going to be done anyways and much more thoroughly.
Plus if you own a ROM to do this translation, you're breaking the law.
He may not be arrested for it, but he should. Save hacking the game for another five years or even ten. Everything in it is already ruined now because there's no surprises.