Receiving 'Error: Nested Editable Element: ...' when editing a template

Issue Description
When editing a template and you validate the HTML, you receive an error of 'Error: Nested Editable Element: ...' with the id of the element following causing you to not be able to approve the template.

Issue Resolution

This is due to having an element with a 'mkto...' class nested inside another element with a 'mkto...' class. Below is an example: 

<div class="mktEditable">

     <div class="mktEditable"></div>

</div>

You will need to remove the 'mkto...' class reference from one of the elements to be able to pass validation and approve the draft as in the corrected example below: 

<div class="mktEditable">

     <div class="newClassName"></div>

</div>