old_contents: import Notification from 'flarum/components/Notification';
  import username from 'flarum/helpers/username';
  import punctuateSeries from 'flarum/helpers/punctuateSeries';
  
  export default class PostLikedNotification extends Notification {
    icon() {
      return 'far fa-thumbs-up';
    }
  
    href() {
      return app.route.post(this.props.notification.subject());
    }
  
    content() {
      const notification = this.props.notification;
      const user = notification.fromUser();
      const auc = notification.additionalUnreadCount();
  
      return app.translator.transChoice('flarum-likes.forum.notifications.post_liked_text', auc + 1, {
        user,
        username: auc ? punctuateSeries([
          username(user),
          app.translator.transChoice('flarum-likes.forum.notifications.others_text', auc, {count: auc})
        ]) : undefined
      });
    }
  
    excerpt() {
      return this.props.notification.subject().contentPlain();
    }
  }
  
new_contents: import Notification from 'flarum/components/Notification';
  
  export default class PostLikedNotification extends Notification {
    icon() {
      return 'far fa-thumbs-up';
    }
  
    href() {
      return app.route.post(this.props.notification.subject());
    }
  
    content() {
      const notification = this.props.notification;
      const user = notification.fromUser();
  
      return app.translator.transChoice('flarum-likes.forum.notifications.post_liked_text', 1, {user});
    }
  
    excerpt() {
      return this.props.notification.subject().contentPlain();
    }
  }
  
subject: Remove notification pluralization logic