For Chinese, I can deffinitly say flashing a CHINA_MAIN or TAIWAN_MAIN for traditional chinese or HONG_KONG_MAIN for simplified chinese would be the easiest thing for you. Otherwise you will need to get ahold of those firmwares anyways and extract the font out of it, and the use far to put it into your phone. And then if you wanted to be able to use the languages, you would then need to also add the .t9 and .lng files to the phone as well as modify some files such as the customize.xml and stuff. The fact that your phone is cid52 will make all that much more dificult than some of the older phones