It's not clear what the behaviour should be regarding
1) when the language button displays
2) and when its empty
# QA steps
[ ] Visit https://en.wikipedia.beta.wmflabs.org/wiki/Special:MovePage/Test_indicators and confirm language button doesn't show
[ ] Visit https://en.wikipedia.beta.wmflabs.org/wiki/Special:Watchlist?hidepreviousrevisions=1&hidecategorization=1&hideWikibase=1&limit=250&days=3&urlversion=2 and confirm language button doesn't show
[ ] Visit https://en.wikipedia.beta.wmflabs.org/wiki/Talk:Spain and confirm language button does show
[ ] Confirm language button does not show on https://en.wikipedia.beta.wmflabs.org/wiki/Talk:Spain?action=watch
# Sign off step
- [ ] Create a task to define a canHaveLanguages method in MediaWiki core.
Note: its possible to have languages on all namespaces except special page (from what I understand)