Merge branch 'master' of https://github.com/bigbluebutton/bigbluebutton into 2.2-add-create-br-to-manage-user-menu

Syncrhonized Youtube video player for meetings (WIP)

HTML5 client locales on 2.2

Avoid duplicated messages. #6500

Fix problems with audio and video in Safari/Webview

Updated index page for 2.2-dev

Added restart for Etherpad

Added End Meeting menu for moderators

Keep poll pane open after publishing results

Merge branch 'master' of https://github.com/bigbluebutton/bigbluebutton into 2.2-add-create-br-to-manage-user-menu

Exclude moderator in the Randomly Assign

Fix a problem with ejected user when private chat is locked.

Added more checks for FreeSWITCH

Re style error component and implements error description.

Set the default draw thickness to 2

Close #6572

Import correction

Add breakout room invitation feature

Limit the zoom functionality in double-tap #6520