Hey! We're not working on localization work quite yet but will be soon, and we're very keen to get translators for Simplified Chinese. It's a very important language for us to support so any help is appreciated.
We expect to start reaching out to people about localisation in the next few months, the best place to find out more is in our Discord server where we have a channel dedicated to localisation. So if you want to hear more I suggest joining there 🙂
Quick note, the Momentum Mod build you named doesn't sound legit. We're currently on version 0.9.0 on Steam, and 0.8.7 publicly - if you want a legit copy the latest version you can get can be found here. The version you're using might be some kind of scam, virus etc so be cautious of that (also if you wanna let us know where that fake copy is being distributed that'd be great, just DM any moderator on Discord).