Merge pull request #4523 from ulferts/fix/aria_hide_wp_display_attr_label

prevent duplicate readout of the wp-display-attr label

frontend/app/components/work-packages/wp-display-attr/wp-display-attr.directive.html

@@ -1,6 +1,8 @@
 <span class="inplace-edit--read-value--container">
 
-  <span class="hidden-for-sighted __d__hidden-for-sighted"></span>
+  <span class="hidden-for-sighted __d__hidden-for-sighted"
+        aria-hidden="true">
+  </span>
 
   <span class="wp-table--cell-span inplace-edit--read-value--value __d__cell"
         ng-click="$ctrl.activateIfEditable($event)"