The whole fixes didn't help.
How do you get it back in German? (Language is in German)
Have you already done this here? https://www.heise.de/...75217.html
Yes
So I just tried it on myself and I can easily switch the language between German and English.
Did you restart the laptop after the change?
Yes
Strange. As I said - it works for me. Maybe it helps if you remove German and then add it again afterwards.
Or you can reset Windows completely.