woocommerce_rename_coupon_messages

woocommerce_rename_coupon_messages

// rename the coupon field on the cart page
function woocommerce_rename_coupon_messages( $translated_text, $text, $text_domain ) {
	// bail if not modifying frontend woocommerce text
	if ( is_admin() || 'woocommerce' !== $text_domain ) {
		return $translated_text;
	}	
	if (strpos($translated_text, 'Coupon') !== false) {
    $translated_text = str_replace('Coupon', 'Promo Code', $translated_text);
}
else 
	if (strpos($translated_text, 'coupon') !== false) {
    $translated_text = str_replace('coupon code', 'Promo Code', $translated_text);
}
		return $translated_text;
}
add_filter( 'gettext', 'woocommerce_rename_coupon_messages', 10, 3 );