Prestashop Email Templates URL Broken After Editing

Prestashop URL broken after editing the email templates, url brackets " { " and " } " are replaced by %7B and %7D. So, it should look like {} instead its look like %7B This email templates problem starts with prestashop

Here are the video from Crezzur about the problem and how to solved it :

click here to download AdminTranslationsController.php file you see in the video