Translate timetable creation

aleksis/apps/lesrooster/frontend/messages/en.json

@@ -44,7 +44,8 @@
     },
     "timetable_management": {
       "menu_title": "Timetable Management",
-      "for_group": "Timetable management for group {group}"
+      "for_group": "Timetable management for group {group}",
+      "timetable_for": "Timetable for {name}"
     }
   },
   "actions":{