Change the WooCommerce add-to-cart button text

add_filter('woocommerce_product_add_to_cart_text', 'shop_add_to_cart_text');
add_filter('woocommerce_product_single_add_to_cart_text', 'shop_add_to_cart_text');

function shop_add_to_cart_text()
{
    return __('Add to basket', 'shop');
}