Merge pull request #4733 from oswaldoacauan/fix-4700

...n-html5/imports/api/presentations/server/eventHandlers.js

...entations/server/handlers/presentationConversionUpdate.js

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

.../components/presentation/presentation-uploader/service.js

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

bigbluebutton-html5/private/locales/en.json