Add data information for backrouting service

frontend/src/app/modules/grids/openproject-grids.module.ts

@@ -57,6 +57,10 @@ export const GRID_ROUTES:Ng2StateDeclaration[] = [
     name: 'my_page',
     url: '/my/page',
     component: MyPageComponent,
+    data: {
+      bodyClasses: 'router--work-packages-my-page',
+      parent: 'work-packages'
+    }
   },
 ];
 

frontend/src/app/modules/work_packages/routing/work-packages-routes.ts

@@ -39,7 +39,6 @@ import {WorkPackagesListComponent} from "core-app/modules/work_packages/routing/
 import {WorkPackageSplitViewComponent} from "core-app/modules/work_packages/routing/wp-split-view/wp-split-view.component";
 import {Ng2StateDeclaration} from "@uirouter/angular";
 import {WorkPackagesBaseComponent} from "core-app/modules/work_packages/routing/wp-base/wp--base.component";
-import {MyPageComponent} from "core-components/routing/my-page/my-page.component";
 
 export const WORK_PACKAGES_ROUTES:Ng2StateDeclaration[] = [
   {