remove comment (#5650)

* remove comment

* remove useless third party lib

* remove comment

frontend/src/models/review-comment.js

@@ -1,24 +0,0 @@
-import moment from 'moment';
-
-class reviewComment {
-
-  constructor(item) {
-    let oldTime = (new Date(item.created_at)).getTime();
-    this.time = moment(oldTime).format('YYYY-MM-DD HH:mm');
-    this.id = item.id;
-    this.avatarUrl = item.avatar_url;
-    this.comment = item.comment;
-    this.name = item.user_name;
-    this.userEmail = item.user_email;
-    this.resolved = item.resolved;
-    if (item.detail) {
-      let detail = JSON.parse(item.detail);
-      this.newIndex = detail.newIndex;
-      this.oldIndex = detail.oldIndex;
-      this.quote = detail.quote;
-    }
-  }
-
-}
-
-export default reviewComment;