Updated mediawiki/extensions
Project: mediawiki/extensions/MultimediaViewer  a62410616dc803d1066df926cb8a8bce7d1725ed

Refactor button things into a separate class

https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/124

Change-Id: Ib4b54164bccbe17e42b223880179531e8d9e6123