Hi, Alice,
The guys behind chinesesqueak are/were using a mailing list Squeak-cn:
http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/squeak-cn
Xinyu Liu (liuxinyu95 at gmail.com) were the force to organize past effort and Kelvin Chang worked a lot on translations and other stuff.
From their Chinese Squeak image, certain number of translations should be extracted and merge to the pootle.
-- Yoshiki