Rename product tabs in WooCommerce

add_filter( 'woocommerce_product_tabs', 'woo_rename_tabs', 98 );
function woo_rename_tabs( $tabs ) {

	$tabs['description']['title'] = __( 'More Information' );		// Rename the description tab
	$tabs['reviews']['title'] = __( 'Ratings' );				// Rename the reviews tab
	$tabs['additional_information']['title'] = __( 'Product Data' );	// Rename the additional information tab

	return $tabs;

}

Change the default state and country on the checkout in WooCommerce

/** 
 * Manipulate default state and countries
 * 
 * As always, code goes in your theme functions.php file
 */
add_filter( 'default_checkout_country', 'change_default_checkout_country' );
add_filter( 'default_checkout_state', 'change_default_checkout_state' );
 
function change_default_checkout_country() {
  return 'XX'; // country code
}
 
function change_default_checkout_state() {
  return 'XX'; // state code
}