Change the language of my app

Hello to all!
I’m creating a tourist app for a college exam and I’d like to put the ability to change the language of the entire app with a switch. (when the switch is ''on' then... translate all the texts).
I only found the option of translating only one 'screen' at a time (so who uses it should select the language on each screen) does this function exist? If yes, how?
Thank you!

how did you translate on one screen? look up in a dictionary?

then you need to save the dictionary to a file or tinyDB. When you switch screen, read the dictionary and look up in it again.

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