Some MediaWiki [extensions](https://www.mediawiki.org/wiki/Manual:Extensions) are missing the `license-name` field in the file `extension.json` or in `$wgExtensionCredits`. This means no license is shown for them in `Special:Version` (e.g. https://en.wikipedia.org/wiki/Special:Version) or the license is displayed as 'License', instead of something like for example `GPL-2.0-or-later`.
To fix this, we need to make changes like https://gerrit.wikimedia.org/r/#/c/264553/ in the relevant extensions.
1) Check the existing `LICENSE` or `COPYING` file of the extension to verify which license the extension has.
2) Look up the corresponding value of that license in https://spdx.org/licenses/
3) Add that value as the value of the `license-name` parameter to the file `extension.json`.
4) Provide your patch for that extension in Wikimedia Gerrit. See https://www.mediawiki.org/wiki/Gerrit/Tutorial for how to set up Git and Gerrit.
Note that some extensions are possibly missing a `LICENSE` or `COPYING` file, which would result in a broken license link.
Note: the 'extensions' listed as wikibase or data values is outside scope of this task. Most of these are actually libraries and instead need to be moved to the libraries section of SpecialVersion. (see: T123937)
**Still to do (missing a line `license-name` in the file `extension.json`) as of 2018-10-05:**
[ ] AkismetKlik
[ ] ArticleRatings
[ ] Athena
[ ] BlueSpiceSubPageTree
[ ] Cargo
[ ] ConfirmEdit/MathCaptcha
[ ] ConfirmEdit/QuestyCaptcha
[ ] ConfirmEdit/ReCaptcha
[ ] ConfirmEdit/ReCaptchaNoCaptcha
[ ] ContributionTracking -> T99643
[ ] Diagnosis
[ ] DiscussionThreading
[ ] GoogleDocTag
[ ] GoogleGeocode
[ ] GooglePlaces
[ ] Hovergallery
[ ] Hreflang
[ ] LifeWebCore
[ ] LockDownEnglishPages
[ ] MagicNumberedHeadings
[ ] MarkAsHelpful
[ ] MintyDocs
[ ] MP3MediaHandler
[ ] NumberOfWikis
[ ] OAuthAuthentication
[ ] OpenIDConnect
[ ] PageDisqus
[ ] PageLanguage
[ ] PhpTagsWidgets
[ ] Prezi
[ ] Quantcast
[ ] QuickSearchLookup
[ ] SafeDelete
[ ] SearchExtraNS -> T100957
[ ] ShoutWikiAds
[ ] SimpleSAMLphp
[ ] SkinPerPage -> T203832
[ ] Snippet
[ ] StaffEdits
[ ] StatCounter
[ ] Tabber
[ ] Theme
[ ] UserAgreement
[ ] WhitelistPages
Extensions which are done:
[x] AJAXPoll
[x] CommentStreams
[x] Contributors
[x] ExternalArticles
[x] NukeDPL
[x] HoverGallery
[x] OpenLayers
[x] PluggableAuth
[x] PronunciationRecording
[x] Push
[x] QuickGV
[x] SecureSessions
[x] SemanticTitle
[x] TwnMainPage
[x] TestLanguageNameGrammar
[x] WikipediaExtracts