Updated frontend

frontend/dashboard.java

@@ -32,7 +32,7 @@ import java.util.Map;
  * </ul>
  */
 @Route(path = "/dashboard.html")
-public final class dashboard implements WebPage {
+public final class dashboard extends WebPage {
 
     private static Integer normalizeNullableInt(String s) {
         if (s == null) return null;