I haven't figured out what caused this yet, but I can see that https://translatewiki.net/wiki/MediaWiki:Nstab-module/qqq and https://translatewiki.net/wiki/MediaWiki:Tooltip-ca-nstab-module/qqq have been edited as late as December 2016. This seems really suspicious. Compare with https://translatewiki.net/wiki/MediaWiki:Nstab-template/qqq and https://translatewiki.net/wiki/MediaWiki:Tooltip-ca-nstab-template/qqq which haven't been edited since 2012 and 2013.

Adding Liuxinyu970226, not because I think you've done anything wrong, but because you've edited https://translatewiki.net/wiki/MediaWiki:Nstab-module/qqq and maybe can help figure out what's gone wrong.

This is a new message (rELUA212325d8d3d772f916c4025ed227ea773e4ed997) which has not yet been translated into Swedish (https://translatewiki.net/wiki/MediaWiki:Nstab-module/sv).

If it gets a translation on translatewiki, the English text will go away.

Oh, ok. But I'm not sure I understand. Why/how did it work before? Or phrased differently, which problem was solved that was worth breaking it? I'm just curious.

There's no linked Phabricator task on that patch. Let's ask @Base directly.

To not repeat the same words, I explained it in the patch comments: https://gerrit.wikimedia.org/r/#/c/328590/ see the zhwiki example.

Not MediaWiki core but Scribunto.

Please inform if the issue reported has been successfully resolved after @Base's patch. Thank you.