You asked a question and someone offered a suggestion you were not looking in the right place. Then you become incredulous at their suggestion and start asking a whole bunch of sarcastic questions implying relevancy.
How about you google you problem and figure it out? No one will help you with that attitude.
how does it help me to read that you don't have the same problem?
I have used Mull on multiple devices and have never encountered that issue. I do not believe that reverting about:config settings is a feature of Mull. Perhaps that itself is an issue with some setting, I do not know.
thanks for testing. I wanted to see if it's rather the os that's triggering the change
force stop mull
change region in android
open mull, about:config
language is set automatically to the new region of the android (in settings it's still English (US). I didn't modify Mull. This is the default behavior 🤷