http://babelfish.altavista.com/ for a Japanese->English translator, but I'm not sure what you mean on your second sentence. If you're looking for an English version of RPG Maker XP, there's quite a few websites that have the cracked, non-server-validating version translated, but I'm not personally giving the link out because of the whole piracy thing.

(I'll just say to search Google for it. Otherwise..)