Hi Anders
Thanks for your answer.
It took me some time to figuer out a solution for the translation but i found out finally.
For everyone who is able to code there is the option to register a new string containing the intro text.
In my case I found a plugin “polylang register all strings” https://www.epicwpsolutions.com/plugins/polylang-register-all-strings/ which helped to do this without coding. It overwrites the the Text writen in the customizer box.
Bye
Samuel