You can change your preferred language on the Wise website. To change it on the app, you'll need to change your phone's language settings first.
Web and android
Go on your name at the top
Go to Display, security and privacy under Settings
Go on Language under Display
Choose your language from the drop-down and Save
iOS
Go on your name at the top
Go on Settings
Go on Language
Choose your language from the drop-down and Save