[Magento] Change the text of the “Upsell Products” tab within product listings

Go to

app/design/frontend/default/your theme/template/catalog/product/list/upsell.phtml

 

<strong>
<span><?php echo $this->__(‘Upsell Products’) ?></span>
</strong>

To

<strong>
<span><?php echo $this->__(‘Customer Who Bought This Item Also Bought’) ?></span>
</strong>