Testing localizations when running your app
Run your app in each language and region you support to thoroughly test your app.
Overview
After you translate strings and adapt resources for the different cultures and regions, test each localization in your app by choosing the language and region in the Run scheme.
Select a language and region in the scheme
To test your app in a specific language and region:
In Xcode, choose Product > Scheme > Edit Scheme.
In the dialog, select Run in the sidebar and click Options on the right.
From the App Language pop-up menu, choose the language and from the App Region pop-up menu, choose the region.
Click Close.
In the project window toolbar, choose a run destination and click Run.
To use the Language & Region settings on the device, choose System Language and System Region from the pop-up menus.