With SF 4, you can change the voices in the fights and cut scenes but just remember that you can't change the menu or subtitle language etc. (Or atleast i can't)
I don't know if Biohazard is bilingual and, I'm not so sure if Biohazard is censored in Japan but Fallout 3 is (Although only for Nuclear Material, Perhaps that is what you were thinking of?)
Fallout 3 Censored in Japan for Nuclear Material - Shacknews - PC Games, PlayStation, Xbox 360 and Wii video game news, previews and downloads