OK, I have got it this thing to work and this is how I did it:
For Chinese fonts, you have to make sure the font filename in the system is in ENGLISH, not chinese, and the name stored inside font.txt is in english as well. System language does not matter for chinese, just set all font.txt files as DEFAULT. You can also install 2 different fonts for 2 different languages. I think this is mentioned somewhere, maybe madman did. But I got it off Meizu BBS and it works. Below are some quick snaps I took with new chinese traditional and english fonts.
