My localisation went weird after the last upgrade too. SDDM shows ?? as my locale now, instead of Australia
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Plasma 6 Bugs
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@ada @guillermohs9 Did you get a tzdata update? Maybe it was set wrong by mistake. I'd use timedatectl to check it.
Any idea what file in my .config can I change / delete to reset language settings?
I will look into it later, but even after selecting Spanish (from Spain) as system language, several strings remain untranslated, which is weird, because I remember seeing them in Spanish before.
I have a few things in my Plasma desktop that is not translated. So it seems to be the same as you encounter.
I've just learned to live with it, since it's likely just untranslated strings somewhere.