I am on EndeavourOS with the most recent gnome packages installed. Since a few days I have an issue with english language popping up which should not happen.
Everything is in german. The menues, the extension, everything. Except for the popup menu that I get when I do a right click on the desktop background:
This was not the case a few days ago. Something has changed and I do not know what. Along with this language topic I see a new behavior of the screenshot function (Print key). It now stores screenshots in ~/Bilder/screenshots. In the past it stored them in ~/Bilder/Bildschirmfotos.
My guess would be that some of them calls Gettext.textdomain(), which doesn’t just set the domain for the extension in question (as intended), but for the entire gnome-shell process.
That was actually it. When I deactivate extensions, the popup is back to german. Activating one extension after the other reveals that the Forge tiling extension is causing the issue. It is reproducable: enable/disable this extension and logout and login again.
Thank you for helping. I will have to file an issue with that Forge extension.