Hi, and thank you for your interest!
RPG Maker MV is being translated using Weblate, a web tool designed to ease translating for both developers and translators.
Translation project for RPG Maker MV into Chinese (Simplified) currently contains 4853 strings for translation and is 69.9% complete.
If you would like to contribute to translation of RPG Maker MV, you need to register on this server.
Once you have activated your account just proceed to the translation section.