Created attachment 147869 [details]
Both instances of the wrong language (install on the left, lock screen on the right)

Some elements are being displayed in the wrong language for me during and after the Manjaro KDE Plasma setup (see screenshot). They are displayed in German despite the chosen OS language being English. One of the elements displayed wrongly is the the date and time in the lock screen. The other is part of the installation process (is that a KDE thing or a separate issue?).

There are two explanations I can think of with a reasonable probability:
- During install, the installer (rightly in my case) defaulted to German. I switched it to English. Perhaps some things were accidentally kept out of the language change?
- I only switched my OS language. I kept keyboard layout, timezone etc as German(y). Perhaps, those things are shown in German based on those settings?

Strangely, for the image on the left, the first explanation would seem more likely, but for the one on the right, I'd favor the second explanation. I tried changing time zones to see what happens and the option that was displayed for Germany was written with an English example, and it also said "English (Germany)". However, changing the format to that (hitting "apply", of course) and restarting does not fix the issue. The language for the date is still German.

In my case, the issue is minor, but if it also appears for locations where different alphabets are used, that might be a problem.

STEPS TO REPRODUCE
1. Have the setup default to German (I'm guessing you can make that happen using a VM?)
2. Change OS language to English, but keep date formats etc German (keyboard layout can probably be changed so you can use the OS?)
3. (change time zone to "English (Germany)" and re-log / reboot to give the change the chance to take effect)

OBSERVED RESULT
One line during setup and the lockscreen date will be displayed in German despite the OS language being English.

EXPECTED RESULT
If the system language is changed, every part of the OS should default to that language - particularly during the installation process. Had I tried to install my OS in Korea, I would have had no idea what that line said. The date is just an inconvenience, but given how often that screen is seen, it's a very prominent one.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kernel 5.15.28-1-MANJARO (64-bit)
(available in About System)
KDE Plasma Version: 5.24.3
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.3

Hopefully I didn't miss an existing report during my search. Also, my apologies for any mistakes. As I'm sure you can tell, I'm new here. If you have questions, I'll do my best to provide further information. Happy hunting!