List of steps to reproduce (step by step, including full links if applicable):
- Go to any page in the Wikimedia Incubator, like the Main Page: https://incubator.wikimedia.org/wiki/Incubator:Main_Page
- Observe that there is an "Add interlanguage links" in the toolbox on the left
- Click it
- Try to enter anything in the first box (Language) in the widget
- No matter what language you enter, nothing shows up, and you can't proceed
What should have happened instead?:
As long as the Wikimedia Incubator isn't a Wikidata client (not sure this is the right term?) that you can add interwiki links to, the "Add interlanguage links" should not be shown.
Software version (if not a Wikimedia wiki), browser information, screenshots, other information, etc.: MediaWiki 1.39.0-wmf.16 (7b42570), WikibaseClient f739e77