Merge pull request #5177 from KDSBrowne/z-02-accessibility-zeeshan-1

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

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

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

...ui/components/settings/submenus/application/component.jsx

...omponents/settings/submenus/closed-captions/component.jsx

...ui/components/settings/submenus/data-saving/component.jsx

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

...ton-html5/imports/ui/components/user-avatar/component.jsx

...s/ui/components/user-list/user-list-content/component.jsx

...s/user-list/user-list-content/user-messages/component.jsx

...er-list/user-list-content/user-participants/component.jsx

...rticipants/user-list-item/user-list-content/component.jsx

bigbluebutton-html5/private/locales/en.json