Use existing permissions

aleksis/apps/chronos/frontend/index.js

@@ -20,7 +20,7 @@ export default {
         inMenu: true,
         titleKey: "chronos.timetable.menu_title",
         icon: "mdi-grid",
-        permission: "chronos.view_timetables_rule",
+        permission: "chronos.view_timetable_overview_rule",
       },
     },
     {
@@ -28,7 +28,7 @@ export default {
       component: Timetable,
       name: "chronos.timetableWithId",
       meta: {
-        permission: "chronos.view_timetables_rule",
+        permission: "chronos.view_timetable_overview_rule",
       },
     },
   ],