My app support english, german and italy. If use load app with france interface language, app will have english interface. So is it possible to change default language and how? I want to make german as a default language.
It's in the phone configuration.
When you chose the iPhone language you don't just choose 1 language but an order of all the available language. In France phone are configured like that:
So if French isn't available, the app is in english.