I've seen language localization software that could turn the English language Pocket PC interface into Arabic, Polish, Russian, Farsi and other languages at
ECTACO but nothing to do it the other way around. There's a different program called
CE-STAR that will turn the English Pocket PC interface into a Chinese or Japanese interface but again not the other way around. MOBEM the folks who make CE-STAR have offices in Beijing maybe you could contact them and ask if they're working on localization software to do Chinese to English.