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Thank you for this!
It does not really "fix" the issue I'm having though -
while Safari indeed displays in German now (all the menus are in German etc.) websites still seem to show the English version by default.
Did re-start Safari, and the whole Mac for that matter, but nothing changed.
It feels like whatever language / localisation check certain websites are doing pick up the system language, not the app language.
Yes. In System Preferences, in Languages & Region, there is a tab that says "Apps" or something like that (my Mac is in Spanish). You can add any app there and set a different language ...