added german translation

index.html

@@ -28,7 +28,7 @@ <h1>git - the simple guide</h1>
         <p class="meta">
             by <a href="http://www.rogerdudler.com">Roger Dudler</a>
             <br />credits to <a href="http://www.twitter.com/tfnico">@tfnico</a>, <a href="http://www.twitter.com/fhd">@fhd</a> and <a href="http://www.namics.com">Namics</a><br />
-            this guide in <a href="index.fr.html">french</a>, <a href="index.it.html">italian</a>, <a href="index.de.html">deutsch</a><br />
+            this guide in <a href="index.fr.html">french</a>, <a href="index.it.html">italian</a>, <a href="index.de.html">german</a><br />
             please report issues on <a href="https://github.com/rogerdudler/git-guide/issues">github</a>
         </p>
         <img src="img/arrow.png" alt="" />