Remove email support from login (fixes #99)

Change-Id: I1915890303c33cfb7a834fd4095e6cfc81e704fe
diff --git a/dev/demo/sidebar-login.html b/dev/demo/sidebar-login.html
index 2b127f1..5d395a2 100644
--- a/dev/demo/sidebar-login.html
+++ b/dev/demo/sidebar-login.html
@@ -21,7 +21,7 @@
       <fieldset>
   <form action="/user/login" method="POST">
   <legend><span>Anmelden</span></legend>
-    <input name="handle_or_email" placeholder="Benutzername oder Email" type="text">
+    <input name="handle" placeholder="Benutzername" type="text">
     <div>
       <input name="pwd" placeholder="Passwort" type="password">
       <button type="submit"><span>Los!</span></button>