Since update to Xcode 6.1 yesterday there is no correct localization of apps in the iOS Simulator. I switched the language and region to German/Germany and my apps are still
I just do by above answer AlexVoge. Beginner maybe need a picture :]
This was mentioned in the Xcode 6.1 Release Notes
In some situations, [NSLocale currentLocale] may return en_US instead of the chosen locale in the iOS 8.1 simulator.
One possible work around is to set the "Application Language" in the used scheme.
Source: Answer of Yoshihiro Sakamoto in Apple Dev Forum