The language selector now surfaces languages you may want to translate (T290972). A message ( "Missing in X, Y and more") invites users to translate into the language they frequently use in which the article is not available yet.

The initial implementation provide the key functionality, but there are some details to polish. In particular, the current implementation makes the invite fixed to the top of the list of languages so that it remains visible as the user scrolls.

From T290972:

The message is not sticky or floating (it just scrolls up with the language list) and it is not shown in the results while searching. In this way users can focus on language selection if they are not interested in the action.

Currently the message remains visible on top when scrolling, which is not ideal since the user scrolling to find another language is likely to indicate they are not interested in the missing ones. So at that point the invite is just getting in the way.

This ticket proposes for the invite to scroll with the rest of the contents of the list of languages.