Redesign video player (#4911)

* Redesign video player

* Use new video player on static public pages too

* Use media gallery component on static public pages too

* Pause video when hiding it

* Full-screen sizing on WebKit

* Add aria labels to video player buttons

* Display link card on public status page

* Fix fullscreen from modal sizing issue

* Remove contain: strict property to fix fullscreen from columns

app/javascript/mastodon/features/status/components/card.js

@@ -1,4 +1,5 @@
 import React from 'react';
+import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import punycode from 'punycode';
 import classnames from 'classnames';
@@ -22,10 +23,15 @@ export default class Card extends React.PureComponent {
 
   static propTypes = {
     card: ImmutablePropTypes.map,
+    maxDescription: PropTypes.number,
+  };
+
+  static defaultProps = {
+    maxDescription: 50,
   };
 
   renderLink () {
-    const { card } = this.props;
+    const { card, maxDescription } = this.props;
 
     let image    = '';
     let provider = card.get('provider_name');
@@ -52,7 +58,7 @@ export default class Card extends React.PureComponent {
 
         <div className='status-card__content'>
           <strong className='status-card__title' title={card.get('title')}>{card.get('title')}</strong>
-          <p className='status-card__description'>{(card.get('description') || '').substring(0, 50)}</p>
+          <p className='status-card__description'>{(card.get('description') || '').substring(0, maxDescription)}</p>
           <span className='status-card__host'>{provider}</span>
         </div>
       </a>