we fix some coding style issues following the PR

app/authentification/utils.py

@@ -15,7 +15,7 @@ def activate(request, uidb64, token):
     if user is not None and account_activation_token.check_token(user, token):
         user.is_active = True
         user.save()
-        login(request, user, backend='django.contrib.auth.backends.ModelBackend')
+        login(request=request, user=user, backend='django.contrib.auth.backends.ModelBackend')
         return redirect('projects')
     else:
         return render(request, 'validate_mail_address_invalid.html')