better icon for time sort

src/app/components/moderator/moderator-comment-list/moderator-comment-list.component.html

@@ -76,7 +76,7 @@
             matTooltip="{{ 'comment-list.time' | translate }}"
             (click)="sortComments(time)"
             aria-labelledby="access_time">
-      <mat-icon [ngClass]="{time: 'unread-icon'}[currentSort]">history</mat-icon>
+      <mat-icon [ngClass]="{time: 'unread-icon'}[currentSort]">update</mat-icon>
       <span>{{ 'comment-list.sort-list-time' | translate }}</span>
     </button>
 

src/app/components/shared/comment-list/comment-list.component.html

@@ -119,7 +119,7 @@
     <button mat-menu-item
             (click)="sortComments(time)"
             aria-labelledby="access_time">
-      <mat-icon [ngClass]="{time: 'unread-icon'}[currentSort]">history</mat-icon>
+      <mat-icon [ngClass]="{time: 'unread-icon'}[currentSort]">update</mat-icon>
       <span>{{ 'comment-list.sort-list-time' | translate }}</span>
     </button>