[WooCommerce] Add/Rename Product Tabs

functions.php

<?php

// Add product tabs
add_filter( 'woocommerce_product_tabs', 'ching_woo_new_tab' );
function ching_woo_new_tab( $tabs ) {
	// rename description tab title
	$tabs['description']['title'] = __( '商品特色' );
	// add the new tab - specs
	$tabs['specs'] = array(
		'title' 	=> __( '商品規格', 'woocommerce' ),
		'priority' 	=> 20,
		'callback' 	=> 'ching_woo_new_tab_content'
	);
	return $tabs;
}

// The new tab content
function ching_woo_new_tab_content() {
	echo '<div class="content">';
		echo 'Hi!';
	echo '</div>';
}