Merge pull request #6179 from oswaldoacauan/html5-theming

...orts/api/users-settings/server/methods/addUserSettings.js

...utton-html5/imports/ui/components/actions-bar/styles.scss

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

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

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

...l5/imports/ui/components/audio/audio-controls/styles.scss

...html5/imports/ui/components/audio/audio-modal/styles.scss

...l5/imports/ui/components/audio/audio-settings/styles.scss

...-html5/imports/ui/components/audio/audio-test/styles.scss

...n-html5/imports/ui/components/audio/echo-test/styles.scss

...ports/ui/components/audio/permissions-overlay/styles.scss

...orts/ui/components/breakout-join-confirmation/styles.scss

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

...tml5/imports/ui/components/chat/chat-dropdown/styles.scss

...html5/imports/ui/components/chat/message-form/styles.scss

...omponents/chat/message-list/message-list-item/styles.scss

...html5/imports/ui/components/chat/message-list/styles.scss

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

...uebutton-html5/imports/ui/components/checkbox/styles.scss

...n-html5/imports/ui/components/closed-captions/styles.scss