[Gelöst] Flags are not showing in the front end

Background of the issue:
I am trying to see the flags of all the available languages in the front end. The issue can be seen on the page: versteckter Link. I expected to see all the flags of the available languages in all the available domains linked to calisalsaexperience.com, which is the main domain.

Symptoms:
No flags showing in the front end.

Questions:
Why are the flags not showing in the front end?
How can I display the flags of all available languages?