change-language-in-code.md

Programmatically change the app language

// set current language:
Language.setCurrentLanguage(languageAbbreviation)
UserDefaults.standard.set([languageAbbreviation], forKey: "AppleLanguages")
UserDefaults.standard.synchronize()

References

How to programmatically change the app language without restarting the app

https://stackoverflow.com/questions/22061402/change-language-in-the-app-programmatically-in-ios