Merge branch 'develop' into 'master'

src/app/components/all.scss

src/app/components/cards/Comment.scss

src/app/components/cards/PostFull.scss

src/app/components/elements/EmbeddedPlayers/dtube.jsx

src/app/components/elements/EmbeddedPlayers/threespeak.jsx

src/app/components/elements/EmbeddedPlayers/twitch.jsx

src/app/components/elements/EmbeddedPlayers/vimeo.jsx

src/app/components/elements/EmbeddedPlayers/youtube.jsx

src/app/components/elements/ReplyEditor.jsx

src/app/components/modules/PostAdvancedSettings.jsx

src/app/components/modules/PostAdvancedSettings.scss

src/app/components/modules/SidePanel/index.jsx

src/app/help/en/faq.md

src/app/help/en/welcome.md

src/app/locales/en.json

src/app/locales/fr.json

src/app/utils/ExtractContent.js

src/app/utils/Links.js

src/app/utils/Links.test.js

src/app/utils/SanitizeConfig.js