[Glitch] Add missing video descriptions

Port ac092d03e7 to glitch-soc

app/javascript/flavours/glitch/features/report/components/status_check_box.js

@@ -36,6 +36,7 @@ export default class StatusCheckBox extends React.PureComponent {
               <Component
                 preview={video.get('preview_url')}
                 src={video.get('url')}
+                alt={video.get('description')}
                 width={239}
                 height={110}
                 inline

app/javascript/flavours/glitch/features/status/components/detailed_status.js

@@ -60,6 +60,7 @@ export default class DetailedStatus extends ImmutablePureComponent {
           <Video
             preview={video.get('preview_url')}
             src={video.get('url')}
+            alt={video.get('description')}
             inline
             sensitive={status.get('sensitive')}
             letterbox={settings.getIn(['media', 'letterbox'])}

app/javascript/flavours/glitch/features/video/index.js

@@ -323,6 +323,7 @@ export default class Video extends React.PureComponent {
           role='button'
           tabIndex='0'
           aria-label={alt}
+          title={alt}
           width={width}
           height={height}
           onClick={this.togglePlay}