[group] added 'search group members'

- 'search group members' is offered only when there are more than 10
members in the group

frontend/src/utils/utils.js

@@ -1382,4 +1382,11 @@ export const Utils = {
     return level;
   },
 
+  // for a11y
+  onKeyDown: function(e) {
+    if (e.key == 'Enter' || e.key == 'Space') {
+      e.target.click();
+    }    
+  }
+
 };