We discovered when trying to save that the Termbox will be impacted by changes in the languages that the wikibase no longer supports. E.g. for wikidata.org Toki Pona. See:
https://gerrit.wikimedia.org/r/c/wikibase/termbox/+/499187
We should decide in a way theses should be handled in current and historic revisions:
Options include:
- Show nothing and pretend the languages aren't there
- show the language code
- try and figure out the language name and show it
We could also optionally or not hint that the language is now removed.
Lowest cost is probably hide it and pretend it isn't there. By @Tarrow that would be fine but we should make a conscious decision on this compromise