Change WooCommerce Store Notice (top of page)

change-wording-woocommerce-store-notice.php

<?php
/*
 * Change WooCommerce store notice text
 *
 */
function fp_replace_dismiss( $notice ){
	return str_replace( 'Dismiss', 'X', $notice );
}
add_filter( 'woocommerce_demo_store','fp_replace_dismiss' );