Add example of Arabic index, to show RTL support.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@enix.org>

talks/lsm-2012.tex

@@ -192,6 +192,12 @@
   \end{center}
 \end{frame}
 
+\begin{frame}{Hackfest \#2 result}
+  \begin{center}
+    \includegraphics[height=0.8\textheight]{arabic-index.png}
+  \end{center}
+\end{frame}
+
 \begin{frame}{Server migration, october 2010}
   Our initial server, having 250 GB of hard disk space, was completely
   filled with the OpenStreetMap database.\\