correct ancilliary to ancillary in header

Author: possumbilities

templates/includes/header.html

@@ -14,7 +14,7 @@ <h1><a class="identity-logo" href="/">Creative Commons</a></h1>
       </ul>
     </nav>
 
-    <nav class="ancilliary-menu">
+    <nav class="ancillary-menu">
       <ul>
         {% if languages_and_links %}
         {% include "includes/languages_dropdown.html" %}