Merge pull request #8077 from jfsiebel/lock-modal-update

...imports/api/meetings/server/methods/toggleLockSettings.js

.../meetings/server/methods/toggleWebcamsOnlyForModerator.js

...on-html5/imports/ui/components/lock-viewers/component.jsx

...on-html5/imports/ui/components/lock-viewers/container.jsx

...utton-html5/imports/ui/components/lock-viewers/service.js

...tton-html5/imports/ui/components/lock-viewers/styles.scss

...uebutton-html5/imports/ui/components/switch/component.jsx

bigbluebutton-html5/private/locales/en.json