Yes, that is normal. To fully swap to a new language you need to reboot.

All already running applications keep their language. If you start a new one or restart an application it will change the language.

The entire locale system was originally designed to change the language on the fly, but with modern applications you have locale strings everywhere and it is simply not possible to react on a language change without an immense amount of work.

That is why applications are just loading a catalog during launch and then stick with it.

[ Edited by geit 20.10.2021 - 19:47 ]