Localize other labels through the application

bigbluebutton-html5/imports/locales/en.json

...mports/ui/components/audio-modal/join-audio/component.jsx

...ports/ui/components/audio-modal/listen-only/component.jsx

...l5/imports/ui/components/audio-notification/component.jsx

...ton-html5/imports/ui/components/enter-audio/component.jsx

...rts/ui/components/whiteboard/slide-controls/component.jsx