In the BIS Launcher, if there's a mod with Chinese characters in the name you need to download, and you click on "Find in Steam Workshop" (because I like to check the filesize first, because most are massive illegal repacks), the Launcher sends the search results to the browser as ASCII codes, and Steam searches for a bunch of non-existent numbers or garbage ASCII characters. Presumably this only works correctly IF you have the Chinese language pack installed in Windows 10.

I marked this as MAJOR, because if you want to join a server with a Chinese mod, then you simply cannot.