Reintroduce email support for login (fixes #165; reverts #e208d30513f7cfafb6405324fee5b88902dcf2fb) - 2

Change-Id: Ia145f1e47295e2e5df0248604262024f87583bab
diff --git a/dev/demo/sidebar-login.html b/dev/demo/sidebar-login.html
index 5d395a2..05e0608 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" placeholder="Benutzername" type="text">
+    <input name="handle_or_email" placeholder="Benutzername" type="text">
     <div>
       <input name="pwd" placeholder="Passwort" type="password">
       <button type="submit"><span>Los!</span></button>