Creates a saved reply template together with its first piece of text: canned_response_title and default_language are stored on the template, while message_language, message_text and audio_message become its first language entry. The template and its text are written one after the other rather than as a single transaction, so a failure on the second step leaves a template with no text. The response does not include the new template's id — list canned responses to pick it up.