[cflsystems]

This was the code in 4.1.x in head.tpl
I can't find it in 4.2 but maybe it will work the way it is or you will have to change it a little bit.

{******** Remove this line to display how much products there are online ****
<tr>
{insert name="productsonline" assign="_productsonline"}
 <td colspan="2" class="NumberOfArticles" align="right">
{if $config.Appearance.show_in_stock eq "Y"}
{insert name="itemsonline" assign="_itemsonline"}
{$lng.lbl_products_and_items_online|substitute:"X":$_productsonline:"Y":$_itemsonline}
{else}
{$lng.lbl_products_online|substitute:"X":$_productsonline}
{/if}
&nbsp;
 </td>
</tr>
**** Remove this line to display how much products there are online ********}