[PrestaShop][1.6] Edit the topics of e-mail with informations about order

Target: Edit the topics of e-mail with informations about order in PrestaShop 1.6
File: /classes/order/OrderHistory.php
Class: OrderHistory
Method: addWithemail()
Variable: $topic
Info: This variable contains topic of the e-mail.
Example: Continue reading [PrestaShop][1.6] Edit the topics of e-mail with informations about order