Non-standard content language dropdown may cause accessibility problems

[osma]

At which URL did you encounter the problem?

http://localhost/Skosmos/en/

The content language dropdown is implemented as a button element and an unordered list (ul) containing all the language values, plus some JS+CSS code to tie them together so it looks like a menu. This is a non-standard implementation of a dropdown menu; a plain select form element would be better, though probably more difficult to style.

When checking for accessibility issues using the WebAIM checker (#1040), it complains about orphaned label elements next to the language dropdown. But the underlying issue is the implementation of the language dropdown, not the label element next to it.