Currently we do not have any special handling of the language button or menu for the situation where an article has no other available languages. While we don't want to over-invest in a short-term solution here it would be great to at least have a minimal solution here.
- note: would also like to change the label from "0 languages" to something more descriptive/less confusing
=== Acceptance criteria
 Empty state button must have label: "Add languages"
 Selecting the empty state button would trigger a modal with the text: "This article is not currently available in other languages. You can help to create translations"
 Link to Content Translation special page with the current article selected (see T275147#6863710 for details). Link similar to: