Merge branch 'master' of https://github.com/bigbluebutton/bigbluebutton into start-poll-01

bigbluebutton-html5/imports/ui/components/app/component.jsx

bigbluebutton-html5/imports/ui/components/chat/styles.scss

...on-html5/imports/ui/components/presentation/component.jsx

...omponents/presentation/presentation-overlay/component.jsx

...omponents/presentation/presentation-toolbar/component.jsx

...omponents/presentation/presentation-toolbar/container.jsx

bigbluebutton-html5/private/locales/en.json