Change Out of Stock Text in WooCommerce

functions.php

<?php
add_filter('woocommerce_get_availability_text', 'themeprefix_change_soldout', 10, 2 );

/**
* Change Sold Out Text to Something Else
*/
function themeprefix_change_soldout ( $text, $product) {
if ( !$product->is_in_stock() ) {
$text = '<div class="">Sold out.</div>';
}
return $text;
}