Languages
Adding a language to the listing and the screenshots, and starting it from the default one.
The app's languages are in Settings, with the default one. Each language has its own store text, its own screenshot copy and, unless a screen says otherwise, its own captures.
A language with no store text yet shows No text in this language yet. Start from the default language fills every field with the default language's text, to translate. The screenshot copy works the same way in Design: Create from makes the language's content file with every field filled in.
Right-to-left languages mirror the screenshot layouts. The Languages view shows one screen in every language at once.