(I assume you mean Simplified Chinese)
All you need to do is :
- install Moodle somewhere on your own machine,
- look in the lang directory, and make a copy of the folder "en" ... name it "zh_cn". Make sure all the files in that folder are writable.
- Now you can use the built-in Moodle translation tools (Admin -> Check Language -> Edit language) to edit Chinese phrases.
If you need any help - just let me know!