Use www instead of en on gravatar url

Author: carlbennett

src/templates/User/Update.phtml

@@ -266,7 +266,7 @@ require('./header.inc.phtml');
             <label>Avatar:</label>
             <p style="color:rgba(128,128,128,1);">Currently custom avatars are
               unsupported. You may set your avatar by using
-              <a href="https://en.gravatar.com/">Gravatar</a> and matching your
+              <a href="https://www.gravatar.com/">Gravatar</a> and matching your
               email address.</p>
           </section>
           <section<?php