Use ellipsis + tooltip combo to fix layout on long string

frontend/src/app/components/reward-stats/reward-stats.component.ts

@@ -48,4 +48,8 @@ export class RewardStatsComponent implements OnInit {
         })
       );
   }
+
+  isEllipsisActive(e) {
+    return (e.offsetWidth < e.scrollWidth);
+  }
 }