Merge branch 'patch-1' into 'master'

Show the tool bar from the 3rd comment on

See merge request arsnova/arsnova-lite!260

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

-<div fxLayout="row" id="search-container" *ngIf="comments.length > 0">
+<div fxLayout="row" id="search-container" *ngIf="comments.length > 2">
   <mat-label fxLayoutAlign="center center">
     <mat-icon class="search-icon">search</mat-icon>
   </mat-label>
@@ -72,7 +72,7 @@
   </mat-menu>
 </div>
 
-<div fxLayout="row" fxLayoutAlign="center" *ngIf="comments.length < 1">
+<div fxLayout="row" fxLayoutAlign="center" *ngIf="comments.length < 3">
   <button mat-fab class="fab-extended" (click)="openCreateDialog()">
     {{'comment-list.add-comment' | translate}}
     <mat-icon class="add">add</mat-icon>