About [[Wikimedia:Mobileapp-attribution-osm/en]]

There's a syntax error in this message: the second link should be:

<a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>

I’ve filed a pull request for the fix at GitHub.

Merged, pulled and updated. Thanks.

The same problem occurs here!

That message was dropped from wiktionary app.