Remove visible timestamps for notifications (#9675)

Revert #9423. Issues with line breaks / clutter.

app/javascript/mastodon/features/notifications/components/notification.js

@@ -3,7 +3,6 @@ import PropTypes from 'prop-types';
 import ImmutablePropTypes from 'react-immutable-proptypes';
 import StatusContainer from '../../../containers/status_container';
 import AccountContainer from '../../../containers/account_container';
-import RelativeTimestamp from '../../../components/relative_timestamp';
 import { injectIntl, FormattedMessage } from 'react-intl';
 import Permalink from '../../../components/permalink';
 import ImmutablePureComponent from 'react-immutable-pure-component';
@@ -86,13 +85,12 @@ class Notification extends ImmutablePureComponent {
             <div className='notification__favourite-icon-wrapper'>
               <i className='fa fa-fw fa-user-plus' />
             </div>
+
             <span title={notification.get('created_at')}>
               <FormattedMessage id='notification.follow' defaultMessage='{name} followed you' values={{ name: link }} />
-              <span className='notification__relative_time'>
-                <RelativeTimestamp timestamp={notification.get('created_at')} />
-              </span>
             </span>
           </div>
+
           <AccountContainer id={account.get('id')} withNote={false} hidden={this.props.hidden} />
         </div>
       </HotKeys>
@@ -122,9 +120,9 @@ class Notification extends ImmutablePureComponent {
             <div className='notification__favourite-icon-wrapper'>
               <i className='fa fa-fw fa-star star-icon' />
             </div>
+
+            <span title={notification.get('created_at')}>
               <FormattedMessage id='notification.favourite' defaultMessage='{name} favourited your status' values={{ name: link }} />
-            <span className='notification__relative_time'>
-              <RelativeTimestamp className='notification__relative_time' timestamp={notification.get('created_at')} />
             </span>
           </div>
 
@@ -144,9 +142,9 @@ class Notification extends ImmutablePureComponent {
             <div className='notification__favourite-icon-wrapper'>
               <i className='fa fa-fw fa-retweet' />
             </div>
+
+            <span title={notification.get('created_at')}>
               <FormattedMessage id='notification.reblog' defaultMessage='{name} boosted your status' values={{ name: link }} />
-            <span className='notification__relative_time'>
-              <RelativeTimestamp className='notification__relative_time' timestamp={notification.get('created_at')} />
             </span>
           </div>