Changing Sale Text

I have installed the plugin and it works great. The only issue is it have used the below to change the sale text and it works on my standard product layout but not this product slide. How do I go about changing the SALE! text?

Code used:
?php
add_filter(‘woocommerce_sale_flash’, ‘woocommerce_custom_sale_text’, 10, 3);
function woocommerce_custom_sale_text($text, $post, $_product)
{
return ‘<span class=”onsale”>Special Offer</span>’;
}

The page I need help with: [log in to see the link]