Remove role="form" on a form element.

Role Form should be use on a region of the document that  represents a collection of form-associated elements.
<div role=”form”></div> GOOD
<form role=”form”></form> BAD

templates/default/contact.html

@@ -16,7 +16,7 @@
 
         {block name="contact-form"}
             {form name="thelia.front.contact"}
-            <form id="form-contact" action="{url path="/contact"}" method="post" role="form">
+            <form id="form-contact" action="{url path="/contact"}" method="post">
                 {form_hidden_fields form=$form}
                 <fieldset id="contact-info" class="panel">
                     <div class="panel-heading">