Just wait a while. Nippon Ichi is pretty good about bringing those games over. Mana Khemia 2 for the PS2 just saw U.S. release recently, though, so NIS is probably waiting at least a few months before sending the PSP version over here, at least until the PS2 version has had a chance to make some money.
So just sit tight for a while, and we'll probably see an official localization. It probably won't take any more time than seeing a fan translation from start to finish, especially considering the game is an RPG, which means it's text-heavy.