If a user has more than one language configured on iOS, the user should be able to select the desired language for the app in the iOS settings app in the settings for this app. This is the first app that i‘ve seen that is missing this configuration setting.

I think it‘s mostly adding the languages in the Runner.xcodeproj/project.xcworkspace with Xcode and then adjusting the Info.plist file (add CFBundleLocalizations) and configure CFBundleDevelopmentRegion.

Thanks!