Hi, and thank you for your interest!
Kallithea is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for Kallithea into Chinese (Taiwan) currently contains 2267 strings for translation and is 13.1% complete.
If you would like to contribute to translation of Kallithea, you need to register on this server.
Once you have activated your account just proceed to the translation section.