Update json_client.html

docs/de/json_client.html

@@ -42,7 +42,7 @@
 	<!---<li><a href="zrazkomer.html">Zrážkomer</a></li>-->
 	<li class=""><a href="zapojenie.html">Beteiligung</a></li>   
 	<li class="active"><a href="json_client.html">JSON-Client</a></li>   
-<li><a href="../AR/index.html">AR</a></li>
+<li><a href="../QR/index.html">QR Scanner</a></li>
 <a href="../json_client.html"><img src="https://futbalovysen.sk/wp-content/uploads/slovakia.png" alt="Slovak flag.png, 2,2kB" title="Slovakia" height="32" width="32"></a>
 <a href="../en/json_client.html"><img src="https://i2.wp.com/facsusa.com/wp-content/uploads/2017/05/Flag-of-England.png?ssl=1" alt="English.png, 2,2kB" title="English" height="32" width="32"></a>
 <a href="../fr/json_client.html"><img src="https://i.imgur.com/vX7NaZ7.png" alt="French.png, 2,2kB" title="French" height="32" width="32"></a>