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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.
iPhone User Guide - Apple Support
How to Change App Language on Your iPhone or Mac
How to Change the Language on an IPad
Modify files, folders, and downloads in Files on iPhone - Apple Support
Type to speak using Live Speech on iPhone - Apple Support
Apple Configurator User Guide for iPhone - Apple Support
Customize your Safari settings on iPad - Apple Support
Setup basics - Apple Support
Use tones and ringtones with your iPhone or iPad - Apple Support
Find settings on iPad - Apple Support