I created the following files for the interface.storyboard in the WatchKit application, activating the localization:

In the iOS application, I also have Localisable.strings files where I put all my custom words for a specific language (but I don’t remember how I created it or was created automatically):

How to create a Localizable.strings file in a WatchKit application and tell the WatchKit application to use this file?
At present
myLabel = NSLocalizedString(@"msgMylabel", @"");
displays msgMylabel, not the contents of msgMylabel
Interface.strings (English) msgMylabel "=" my shortcut ";
Interface.strings (German) msgMylabel "=" mein Label ";