'Prestashop New string to translate doesn't appear in my back-office

I'm having a very stupid issue with a new string I need to translate. I added it into my theme file :

File: /themes//order-carrier.tpl

{*Displaying a link to CMS page*} 
{if $carrier.id_carrier == 36} 
    <a href="{$link->getCMSLink(21)}" target="_blank">{l s="My new string"}</a>
{/if}

But when I go to my back-office to translate the string, I can't find this new string (Tools > Translations) ...

I'm using Prestashop 1.4.9 and I disabled Smarty's cache.



Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source