[Geschlossen] remove weird alt tag in language switcher

Background of the issue:
I am trying to remove the alt tag that appears when I hover over the languages (English and Castellano) in the menu bar on my website. The alt tag is showing a weird span class thing instead of the language name. You can see the issue on this page: versteckter Link

Symptoms:
The alt tag in the language switcher is displaying a span class instead of the language name.

Questions:
How can I remove or correct the alt tag in the language switcher?
Why is the alt tag showing a span class instead of the language name?