Resolve RemovedInDjango40Warning

amelie/calendar/participation_urls.py

@@ -1,9 +1,9 @@
-from django.conf.urls import url
+from django.urls import path
 
 from amelie.calendar import views
 
 app_name = 'calendar'
 
 urlpatterns = [
-    url(r'^(?P<pk>\d+)/pay/', views.PayParticipationView.as_view(), name='pay_participation'),
+    path(r'<int:pk>/pay/', views.PayParticipationView.as_view(), name='pay_participation'),
 ]

amelie/oauth/forms.py

@@ -1,6 +1,6 @@
 from django import forms
 from django.forms import widgets
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 
 class OAuth2RequestForm(forms.Form):