Besides, there are plain texts in the template and admin control panel that also need to be translated.
And, to make Chinese characters able to be storaged in the database, the charset in install.sql should be changed to utf8 instead of latin1.
By the way, after I changed the charset and reinstalled the program, the program works all right while the data in phpMyAdmin is not properly shown. I wonder if you can help me on that.
I'll help with the translation in Chinese (both Simplified and Traditional) of the future versions of Traq if I had time.