First of all welcome
I had somehow only bad experiences when playing around with locales and plasma localisation settings in the past Best was to just set it when installing and leave it afterwards
That being said, there is probably a missconfiguration happening somewhere.
What does locale return?
This has nothing to do with proper locale settings, but about translation.
Until now you posted nothing that suggests your locale settings are misconfigured.
Only opinions, which is technically zero value.
Iif you think translation is wrong, or not proper, post at the specific package translation issues, or/and contribute in translation.
Read garuda wiki, how to post.
No images for text.
@sgs when do we start auto-close auto-ban Discource feature for these cases? I thought it was today...