Add frontend tests for comments

src-ui/src/app/components/document-comments/document-comments.component.html

@@ -17,11 +17,11 @@
         </div>
         <div class="d-flex card-footer small bg-light text-primary justify-content-between align-items-center">
             <span>{{displayName(comment)}} - {{ comment.created | customDate}}</span>
-            <btn class="btn btn-link btn-sm p-0 fade" (click)="deleteComment(comment.id)">
+            <button type="button" class="btn btn-link btn-sm p-0 fade" (click)="deleteComment(comment.id)">
                 <svg width="13" height="13" fill="currentColor">
                     <use xlink:href="assets/bootstrap-icons.svg#trash" />
                 </svg>
-            </btn>
+            </button>
         </div>
     </div>
 </div>