Adicionado LANGUAGE_CODE e TIME_ZONE como variáveis de ambiente

.env.template

 ALLOWED_HOSTS=
 DATABASE_URL=
 DEBUG=True
+LANGUAGE_CODE=en-us
 SECRET_KEY=
 TEMPLATE_DEBUG=True
+TIME_ZONE=UTC

project_name/settings.py

@@ -118,8 +118,8 @@ AUTH_PASSWORD_VALIDATORS = [
 # Internationalization
 # https://docs.djangoproject.com/en/1.9/topics/i18n/
-LANGUAGE_CODE = 'en-us'
-TIME_ZONE = 'UTC'
+LANGUAGE_CODE = os.environ.get('LANGUAGE_CODE', 'en-us')
+TIME_ZONE = os.environ.get('TIME_ZONE', 'UTC')
 USE_I18N = True
 USE_L10N = True
 USE_TZ = True