Rename url prefix /transparency → /costs

transparency/urls.py

@@ -22,7 +22,7 @@ from django.views.generic import RedirectView
 
 urlpatterns = [
     url(r'^admin/', include(admin_site.urls)),
-    url(r'^transparency/', include(costs.urls)),
+    url(r'^costs/', include(costs.urls)),
     url(r'^$', RedirectView.as_view(
         pattern_name='index', permanent=False)),
 ]