Activate support for webm
Could webm be added as a file format to be displayed? I linked a file used on Wikimedia Commons on the page Translating:Proofreading the messages but it does not display as a video, only as a link. And even on the file page no preview of the file is available. I guess this is just a configuration issue, and adding webm in the right place is enough.
The README highlights a number of prerequisites, but hopefully easy with Ubuntu packages and puppet: https://phabricator.wikimedia.org/r/p/mediawiki/extensions/TimedMediaHandler;browse/master/README