Not sure, but according to Synaptic:
metapackage for Chinese language support
This metapackage depends on all packages that provide native language
support for applications in Ubuntu (like spell
checkers, dictionaries, OpenOffice and Mozilla locale packages,
If you also want your applications and the desktop to be translated,
please additionally install language-pack-zh.
Firefox Plugin: Chinese text annotation
Do not know if this is any use?