Google Code-in

Some MediaWiki extensions are missing "license-name" in extension.json or $wgExtensionCredits. This means no license is specified for them in Special:Version (e.g. https://en.wikipedia.org/wiki/Special:Version)

To fix this, you will need to make changes similar to https://gerrit.wikimedia.org/r/#/c/264553/ in the code bases of extensions. One needs to check the LICENSE or COPYING file to verify which license the extension has, and then add the license-name.

As well, some extensions are possibly missing a LICENSE or COPYING file, which would result in a broken license link.

You are expected to find three extensions missing license information (for example by checking Special:Version of some MediaWiki sites, or by checking the code via downloading the extension repositories via https://www.mediawiki.org/wiki/Download_from_Git#Download_all_extensions if you have enough internet bandwidth), write three separate patches fixing the problem, putting your patches into Wikimedia Gerrit, and receiving a +1 or a merge.

https://phabricator.wikimedia.org/T123943