WooCommerce: How to change Out of Stock text through filters

/* --------------------------------- */
/* Only works with WooCommerce 2.x.x */
/* --------------------------------- */

/*
Place the following code inside your theme's functions.php
*/


add_filter('woocommerce_get_availability','custom_out_of_stock',10);

function custom_out_of_stock($availability){
    $new_outta_stock = "Your custom text goes here!";
    $availability['availability']= $new_outta_stock;
    return $availability;
}