Following https://docs.djangoproject.com/en/2.0/ref/settings/#languages

ippisite/ippisite/settings.py

@@ -13,7 +13,7 @@ https://docs.djangoproject.com/en/1.10/ref/settings/
 import os
 
 # Build paths inside the project like this: os.path.join(BASE_DIR, ...)
-from django.utils.translation import ugettext_lazy
+from django.utils.translation import gettext_lazy
 
 BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
@@ -134,7 +134,7 @@ TIME_ZONE = 'UTC'
 
 USE_I18N = True
 LANGUAGES = [
-    ('en', ugettext_lazy('English')),
+    ('en', gettext_lazy('English')),
     # ('fr', ugettext_lazy('French')),
 ]