video-provider: fix pagination edge case

Pulled HTML5 locales Aug 21, 2020

video-provider: first tackle at video pagination

video-provider: fix mirrorOwnWebcam behaviour (regression from #10208)

Add presentation slide text for screen readers

Notes and captions footer disabled as default

Something related on not being able to provide links

Fix shared notes and closed captions header button style

Check video data savings to set presentation max-height

Localize drop-down values for webcam quality

Remove mute and clear public chat options from breakouts

Fix text area's being created smaller than a single character

Also adds a little more visibility and well-deserved credit to Etherpad's project

On my server 2.3 alpha, the method metadata_for(meeting_id) gives back {}
(empty Hash). Thus "return if meeting_metadata.nil?" does not occur.

Does @redis.hgetall give {} instead of nil, even though there is a comment in
node_modules/redis/lib/utils.js "hgetall converts its replies to an Object. If
the reply is empty, null is returned"???

video-provider: normalize hidden cameraProfiles constraints

Also add some inlined docs to settings.yml

Allow more tags in welcome message/ mod only message

Pulled HTML5 locales Aug 10, 2020

Improve log for parsed passed parameter error

Remove muteAll and muteAllExceptPresenter from breakouts