Desktop view at https://hi.wikipedia.org/wiki/अंकन_सेन shows a link to add language under language tools, "add links"
The tool looks like this (link next to edit pencil):
This is what appears, clicking on that link
No such link is available in mobile view
We'd need to work out where such an icon goes
- the LanguageOverlay - but how would that work if an article has no languages?
- The new menu that the reading web team is working on as part of (T198313)
We'd need to make sure we make it possible for other extensions to register links in those menus (T65459)
Make the overlay mobile friendly