HTTP GET call fetching articles by section id fails with the following error unless a query parameter for locale is specified (?locale=en-us)
https://...../api/v2/help_center/sections/xxxx/articles.json
zenpy.lib.exception.APIException: {"error": {"title": "Invalid attribute", "message": "You passed an invalid value for the sort_by attribute. The endpoint must specify a locale in order to sort by titles"}}