[Resolved] Floating language switcher in mobile header

Tell us what you are trying to do?
I am trying to add a custom toggle to my mobile menu header, as explained. I want the switcher to be fixed where you can see the red square right now. The red square is made by css background-color of the implemented hook, So I assume it generally works It just does not show the "EN"-Text.
But: There's no content shown. If I add that hook to footer or any other location, it works as it's supposed to work.
The other hook "Rosin" also works flawlessly.

Is there any documentation that you are following?
Yes, here:
https://wpml.org/documentation/getting-started-guide/language-setup/language-switcher-options/adding-language-switchers-using-php-and-shortcodes/?utm_source=plugin&utm_medium=gui&utm_campaign=languages

and here:
https://wpml.org/documentation/getting-started-guide/language-setup/language-switcher-options/custom-language-switcher/

Is there a similar example that we can see?
Sadly not.

What is the link to your site?