Merge pull request #3964 from KDSBrowne/x0-userlist-accessibility-suggestions

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

...mports/ui/components/actions-bar/emoji-menu/component.jsx

...button-html5/imports/ui/components/dropdown/component.jsx

...n-html5/imports/ui/components/dropdown/list/component.jsx

...l5/imports/ui/components/dropdown/list/item/component.jsx

...tml5/imports/ui/components/dropdown/trigger/component.jsx

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

...utton-html5/imports/ui/components/user-list/component.jsx

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

bigbluebutton-html5/private/locales/en.json