gluon-luci-admin: replace overview text

This completely replaces the text on the overview page. Consider this a
placeholder until someone writes a better suited version :)

package/gluon-luci-admin/files/usr/lib/lua/luci/view/admin/index.htm

-<%#
-LuCI - Lua Configuration Interface
-Copyright 2008 Steven Barth <steven@midlink.org>
-Copyright 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-	http://www.apache.org/licenses/LICENSE-2.0
-
-$Id$
-
--%>
 <h2><a id="content" name="content"><%:Hello!%></a></h2>
-<p><%_This is the administration area of <abbr title="Lua Configuration Interface">LuCI</abbr>.%></p>
-<p><%_<abbr title="Lua Configuration Interface">LuCI</abbr> is a free, flexible, and user friendly graphical interface for configuring OpenWrt.%><br />
-<%:On the following pages you can adjust all important settings of this device.%></p>
-<p><%:As we always want to improve this interface we are looking forward to your feedback and suggestions.%></p>
-<p><%:And now have fun with your OpenWrt device!%></p>
-<p><em><strong><a href="<%=controller%>/about"><%_The <abbr title="Lua Configuration Interface">LuCI</abbr> Team%></a></strong></em></p>
+<p>Dies ist der Experten-Modus deines Freifunkknotens.</p>
+<p>Hier kannst du weitere Einstellungen vornehmen, Firmware Upates
+   einspielen und auch vieles kaputt machen.</p>
+<p>Sei bitte vorsichtig!</p>