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You can change the language setting on your iPhone or iPad if it's incorrect or if you've accidentally changed the language to one you don't understand.
Switch an app window to a Slide Over window on iPad - Apple Support
How to Change Language on Your iPhone or iPad
Find settings on iPhone - Apple Support
Get started with accessibility features on iPad - Apple Support
Set up your iPhone or iPad - Apple Support
Create and format notes on iPad - Apple Support
Change the language on your iPhone or iPad - Apple Support
Official Apple Support
How to Change the Language on iPhone & iPad