I like to use the program interface in English. But every time after an update the language is changed back to German.
This doesn't happen in Photoshop and Lightroom.
The language setting should stick, but this might be caused by having a non English (German) OS.
LrC does not use the language settings in the Creative Cloud desktop app, but they are used by Photoshop and Lightroom.
So there's no solution?
Since interface language is part of the preferences, it should not revert to English when you upgrade.
Did you choose to keep the preferences when you upgraded?
If you didn't, the language would probably be set to German.
Does this happen only when you do major upgrades, or also with minor (dot) updates?
It goes back to German and
it is the case with each update.
I've set the language in Creative Cloud to English.
Sounds like they need someone to post an Idea, to Have LrC installs follow the settings for language in ACCDA.
If I were to post an idea about this, I would suggest that other applications behave like LrC, with all available languages built in. Changing the language in for instance Photoshop is time consuming because you have to reinstall.
And for those of us who answer questions on the forums, it is sometimes helpful to be able to easily change the language in LrC when troubleshooting for users that do not use the English version.