HFP-2398 Remove aria-label in action bar

WAIA states it is *not* supposed to be used if there's a visible label

js/h5p-action-bar.js

@@ -51,7 +51,7 @@ H5P.ActionBar = (function ($, EventDispatcher) {
           }
         },
         appendTo: $actions
-      }).attr('aria-label', H5P.t(type + 'Description'));
+      });
 
       hasActions = true;
     };