Merge pull request #8464 from KDSBrowne/add-upload-toast

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

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

...ton-html5/imports/ui/components/actions-bar/component.jsx

...ton-html5/imports/ui/components/actions-bar/container.jsx

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

...mponents/presentation/presentation-uploader/component.jsx

...mponents/presentation/presentation-uploader/container.jsx

...components/presentation/presentation-uploader/styles.scss

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

bigbluebutton-html5/private/locales/en.json