Added SFU error handling in video-provider component with localized messages

bigbluebutton-client/resources/prod/lib/kurento-extension.js

...luebutton-html5/client/compatibility/kurento-extension.js

...-html5/imports/ui/components/video-provider/component.jsx

bigbluebutton-html5/private/locales/en.json

labs/bbb-webrtc-sfu/lib/base/errors.js

labs/bbb-webrtc-sfu/lib/mcs-core/lib/constants/Constants.js

labs/bbb-webrtc-sfu/lib/video/VideoManager.js