I'm a CWOW(chinese wow) player. I have used the roster for a few months, it's very useful for my guild. But I'm bad at PHP so that I couldn't make the roster working so correctly under the zhCN locale. Because of my bugged roster, I can't popularize it to others.
We wanna have a official Chinese localization. With that, more and more players will use the roster and it must be very popular.
I could offer the Chinese localization's translation. As far as I can.

You should simply be able to translate the enUS.php, save it as zhCN.php, and (almost) all text should be localized, and everything should work correctly. In doing this you should substitute all occurrances of enUS to zhCN.