Remove contrib.sites from installed apps

common/settings.py

@@ -37,8 +37,6 @@ TIME_ZONE = 'Europe/Zurich'
 # http://www.i18nguy.com/unicode/language-identifiers.html
 LANGUAGE_CODE = 'fr'
 
-SITE_ID = 1
-
 # If you set this to False, Django will make some optimizations so as not
 # to load the internationalization machinery.
 USE_I18N = True
@@ -96,7 +94,6 @@ INSTALLED_APPS = (
     'django.contrib.auth',
     'django.contrib.contenttypes',
     'django.contrib.sessions',
-    'django.contrib.sites',
     'django.contrib.messages',
     'django.contrib.staticfiles',
     'django.contrib.admin',