Text email order confirm (Shopkit)

<?php
add_filter('tzn_order_email_content', 'tzn_order_email_content', 99, 99);
function tzn_order_email_content($email_content, $order)
{
	$email_content = '<p>' . sprintf(esc_html__('Just to let you know — we\'ve received your order #%s, and it is now being processed:', 'tzn'), esc_html($order->get_order_number())) . '</p>';
	return $email_content;
}
?>