There are 2 languages for this mod, english and chinese, and judging from the .py file contents, it can toggle between them (but i think you need some python code executing files)
You can do what i did and open mod folder, search for "ENG" files, look at their folder, and delete original file with same name, and replace it with ENG file:
mod_info_ENG.json -> rename to mod_info.json
mod_info.json -> delete
there are about 10 files to do it on, so it will take a couple of minutes to do. As for mod being stable, yeah it is, everything works fine from what i've noticed