This started for me a couple of weeks ago and I commented then. Since that time, fixing the settings in MS Edge (that I'd never changed), back to USA English, fixed the issue. Still left me wondering how and why they changed in the first place, but hoping it was an odd glitch and was resolved.
It's gone back to Chinese on the home screen again. I've entered settings in both the laptop operating system, as well as in Edge to set to English. It "worked" for a few days, then reverted to Chinese on the lock screen again, and it will not revert to English for 2 days now even though all settings are still set to USA English.
My concern is if this is a result of some kind of hacking. Not trying to be alarmist, but Microsoft should investigate and communicate what is going on to users.