Edits an existing template of the channel’s WABA. It is identified by template_name (and language if there are several languages). Meta replaces the whole components array and the template goes back to review. Only APPROVED, REJECTED or PAUSED templates can be edited, and the category of an APPROVED one cannot be changed. Provide at least one of components, category or message_send_ttl_seconds. Errors come in externalCode and message. Requires the templates:manage scope.