How to change the User interface language on iOS or Mac

hi everybody
don’t have an iphone or MacOS laptop myself…I’m translating the app so I tried to find language settings on my friend’s Phone/Laptop to check if everything was working fine and I didn’t find the language settings.
is it there?

first of all, thanks for helping on translations! this is very welcome! to your question:

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thank you for the reply I will check that with my friend as soon as possible

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