language code fix

project_base/settings.py

@@ -394,7 +394,7 @@ AUTH_PASSWORD_VALIDATORS = [
 # Internationalization
 # https://docs.djangoproject.com/en/2.0/topics/i18n/
 
-LANGUAGE_CODE = 'de-at'
+LANGUAGE_CODE = 'de'
 
 
 # Local time zone for this installation. Choices can be found here: