old_contents: from django.conf.urls import url
  from . import views
  
  urlpatterns = [
      url(r'^notifications$', views.personal_notifications, name='notifications'),
      url(r'^notifications/system$', views.system_notifications, name='notifications'),
      url(r'^notifications/personal$', views.personal_notifications, name='notifications')
  ]
  
new_contents: from django.conf.urls import url
  from . import views
  
  urlpatterns = [
      url(r'^notifications$', views.personal_notifications, name='notifications'),
      url(r'^notifications/system$', views.system_notifications, name='system_notifications'),
      url(r'^notifications/personal$', views.personal_notifications, name='personal_notifications')
  ]
  
subject: fix duplicate notification urls (#5515)