dublin Westwind knows whart she is talking about in germany. I suspect she is correct.
I don't ask her anything about Germany!
She said that if you want to use French, then you need French in your licence.
If you want to use the radio in Norwegian or French, then you must have Norwegian or French in your license, same with any other language. It does not matter if it's an ICAO language or not.
I asked her to provide a reference for that. Nothing about Germany.