Merge pull request #5285 from KDSBrowne/z-02-accessibility-zeeshan-3

.../ui/components/actions-bar/actions-dropdown/component.jsx

...orts/ui/components/actions-bar/emoji-select/component.jsx

.../imports/ui/components/audio/audio-controls/component.jsx

...html5/imports/ui/components/audio/echo-test/component.jsx

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

...ml5/imports/ui/components/chat/message-list/component.jsx

...ebutton-html5/imports/ui/components/nav-bar/component.jsx

...rts/ui/components/nav-bar/settings-dropdown/component.jsx

...orts/ui/components/user-list/chat-list-item/component.jsx

bigbluebutton-html5/private/locales/en.json