I think it has, although I'm not sure. In fact I can not understand Japanese, but a poor translation by Google says it can be localized by a proper compile option. And I'm already using EBWin on my XP machine with full English menu. EBWin is available here:
http://www31.ocn.ne.jp/~h_ishida/
Mail the distributer linked at the first post if you are interested in porting it. He must be Japanese who can speak English.