Hi, and thank you for your interest!
CopyQ is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for CopyQ into Chinese (China) currently contains 691 strings for translation and is 98.4% complete.
If you would like to contribute to translation of CopyQ, you need to register on this server.
Once you have activated your account just proceed to the translation section.