All the Chinese fonts which come with X.org are in the repository. You can find them and install them with gslapt.
To localize for any language system-wide you have to edit /etc/profile.d/lang.sh As root, edit this file with your favorite text editor. There is a line near the top that reads:
change that to either:
whichever is appropriate for you. Also add the line:
export LC_ALL=zh_CN.UTF-8 (or)
Any applications , menus, help files, etc... that include appropriate Chinese translations will display in Chinese instead of English. If you use KDE you will also want to install the appropriate KDE i18n package. DItto koffice (i10n). We also have aspell dictionaries and language packs for firefox, sunbird, and thunderbid in our repository. You will ant to install all the relevant packages for the applications you use.
I hope this helps.