I just did what I described above. No separate call, only build the project but no entries are created.

OK, maybe the answer was too simple, nobody expected me to look for this solution: Xcode can of course only recognise the strings if they were previously marked with String(localized: "Your text"). So far I have understood it now. However, I have not yet managed to find out how Xcode recognises texts that have been defined in the storyboard, i.e. on the user interface builder, in various elements such as buttons, labels etc. outside the code. Such texts do not appear in my file localizable.xcstrings (string catalogue) yet. How can I persuade Xcode to include such texts in the string catalogue? Stephan