Updated mediawiki/extensions
Project: mediawiki/extensions/BetaFeatures  52a58b316df8d4f37265c226488c99d482672e09

Make final design changes

* Checked icon now SVG
* Made auto-enroll an HTMLTextBlockField (new class)
* Removed screenshot for auto-enroll
* Changed some l10n strings to conform to design

Change-Id: Idb96bbeaba58e3c6ac8c136137c3cf9573ee86b8