Isn't it likely there are localized versions? German, French, Spanish... Sounds more likely.
Anyway this is a point where there is an advantage for not being a native english speaker... The voices sound just as annoying as any person speaking english. Doesn't really bother me. Of course, original language would be better, as unacchievable as that might be...

What does bother me is content (like barbarians calling themselves barbarians) but that's another subject.