When trying to edit eMail templates via /admin/manage_email_templates.php the edit section is hidden by default. When I inspected it, it was hidden by a no-show class: <div id="editEmailSection" class="no-show">
When edited to <div id="editEmailSection" class="show"> I can see the template in question but clicking update only produces a ? and changes are not saved. Am I missing a setting here? I tried both enforce.custom.mail.template=false and true as this seemed to be the only setting related (right?) but both options had the same outcome.

Please see screenshots below.

Original file

Edited file

When trying to update changes