base username from CSR on hidden input instead of spans randomly in the html

public/js/new_certificate.js

@@ -14,7 +14,7 @@ $(function () {
            return;
        }
 
-       var user = $('.user').text();
+       var user = $('#user-input').val();
 
        var keys = forge.pki.rsa.generateKeyPair(1024);
        var csr = forge.pki.createCertificationRequest();

views/panel/certificates/new.html.twig

@@ -50,6 +50,7 @@
                         </div>
                     </div>
                 </div>
+                <input type="hidden" value="{{ user.getUsername() }}" id="user-input">
             </div>
         </div>
     </div>