Merge branch 'origin/master' into sync/upstream

Conflicts:
	app/javascript/mastodon/components/status_list.js
	app/javascript/mastodon/features/notifications/index.js
	app/javascript/mastodon/features/ui/components/modal_root.js
	app/javascript/mastodon/features/ui/components/onboarding_modal.js
	app/javascript/mastodon/features/ui/index.js
	app/javascript/styles/about.scss
	app/javascript/styles/accounts.scss
	app/javascript/styles/components.scss
	app/presenters/instance_presenter.rb
	app/services/post_status_service.rb
	app/services/reblog_service.rb
	app/views/about/more.html.haml
	app/views/about/show.html.haml
	app/views/accounts/_header.html.haml
	config/webpack/loaders/babel.js
	spec/controllers/api/v1/accounts/credentials_controller_spec.rb

app/javascript/mastodon/features/ui/components/modal_root.js

@@ -14,6 +14,7 @@ import {
   ConfirmationModal,
   ReportModal,
   SettingsModal,
+  EmbedModal,
 } from '../../../features/ui/util/async-components';
 
 const MODAL_COMPONENTS = {
@@ -25,6 +26,7 @@ const MODAL_COMPONENTS = {
   'REPORT': ReportModal,
   'SETTINGS': SettingsModal,
   'ACTIONS': () => Promise.resolve({ default: ActionsModal }),
+  'EMBED': EmbedModal,
 };
 
 export default class ModalRoot extends React.PureComponent {