Remove novalidate on the form element

templates/default/login.html

@@ -16,7 +16,7 @@
         <article class="col-main" role="main" aria-labelledby="main-label">
             <h1 id="main-label" class="page-header">{intl l="Login"}</h1>
             {form name="thelia.customer.login"}
-            <form id="form-login" action="{url path="/login"}" method="post" role="form" novalidate {form_enctype form=$form}>
+            <form id="form-login" action="{url path="/login"}" method="post" role="form" {form_enctype form=$form}>
                 {if $form_error}<div class="alert alert-danger">{$form_error_message}</div>{/if}
                 {form_field form=$form field='success_url'}
                     <input type="hidden" name="{$name}" value="{navigate to="return_to"}"> {* the url the user is redirected to on login success *}