[web] implemented twig templating system (#4264)

Signed-off-by: Kristian Feldsam <feldsam@gmail.com>

data/web/templates/admin/tab-ldap.twig

@@ -0,0 +1,7 @@
+<div role="tabpanel" class="tab-pane" id="tab-config-ldap-admins">
+  <div class="panel panel-default">
+    <div class="panel-heading">{{ lang.admin.admins_ldap }}</div>
+    <div class="panel-body">
+    </div>
+  </div>
+</div>