Prestashop如何在现有模块（Paypal）中添加新的翻译字段？

I need to add new translation for the newly added word in the Paypal payment module.How it possible to add a new translation filed in the module paypal ?

Please help me to do this..

If the new text is in the tpl

{l s='My new text' mod='paypal'}

If it's in a php file

$this->l('My new text')

Then you can translate it in admin tab

Tools > Translation : ps 1.4

Localisation > Translation : ps 1.5