Change Single Product Tab Titles and Headings

functions.php

<?php
/**
 * Tab Title filters do not work with WooCommerce 1.6.5.1 or lower
 * Please download this zip file http://cl.ly/2Y3S3D3M3C23 , extract the 3 files and copy them to :
 * wp-content/themes/YOUR_THEME/woocommerce/single-product/tabs/
 **/


add_filter ( 'woocommerce_product_description_tab_title', 'custom_product_description_tab_title' ) ;
function custom_product_description_tab_title() {
	return 'Description'; // Change Me!
}

add_filter ( 'woocommerce_product_description_heading', 'custom_product_description_heading' ) ;
function custom_product_description_heading() {
	return 'Product Description'; // Change Me!
}

add_filter ( 'woocommerce_product_additional_information_tab_title', 'custom_product_additional_information_tab_title' ) ;
function custom_product_additional_information_tab_title() {
	return 'Additional Information'; // Change Me!
}

add_filter ( 'woocommerce_product_additional_information_heading', 'custom_product_additional_information_heading' ) ;
function custom_product_additional_information_heading() {
	return 'Additional Information'; // Change Me!
}

add_filter ( 'woocommerce_reviews_tab_title', 'custom_product_reviews_tab_title' ) ;
function custom_product_reviews_tab_title() {
	return 'Test Reviews'; // Change Me!
}

?>