**Steps to replicate the issue** (include links if applicable):
* https://de.wikipedia.org/w/api.php?action=query&list=querypage&qppage=GadgetUsage&qplimit=max
* https://es.wikipedia.org/w/api.php?action=query&list=querypage&qppage=GadgetUsage&qplimit=max
**What happens?**:
`"title": "Spezial:Badtitle/NS1346:gadget-Rechtschreibpruefung"`
`"title": "Especial:Badtitle/NS777:gadget-CorrectorOrtografico"`
**What should have happened instead?**:
Not entirely sure, on [[https://en.wikipedia.org/w/api.php?action=query&list=querypage&qppage=GadgetUsage&qplimit=max|enwiki]] it returns `"title": "Gadget:gadget-Navigation popups"`. ~~But Gadget: is no valid namespace on enwiki either me thinks.~~ Valid namespace, unused though so arguably still wrong.
On other projects the value for "ns" is the number of active users. On enwiki it's always 2300. See also T120895.