Change “out of stock” text on specific products

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Hi, we have tried to change the “out of stock” text on specific products with the following code, but it does not work..

add_filter( ‘woocommerce_get_availability’, ‘wcs_custom_get_availability’, 10, 2);
function wcs_custom_get_availability( $availability, $_product ) {

// Out of stock
if ( ! $_product->is_in_stock() && $_product->get_id() == ‘18496’ && ‘17392’ ) {
$availability[‘availability’] = __(‘Dette hold er desværre udsolgt’, ‘woocommerce’);
}

return $availability;
}

What are we doing wrong?