Custom Shop button text

Hi Guys,

I want to change the “Details” tekst on the buttons with the product type “advanced_ad” but it does not seem to work. Is there any other way?

add_filter( 'woocommerce_product_add_to_cart_text', 'mc_edit_shop_button_text' );

function mc_edit_shop_button_text() {
    global $product;
    $product_type = $product->get_type(); 

	if ($product_type == "advanced_ad") {
    	return __('Stel advertentie samen', 'woocommerce');
    }
}