add spanish translation to David O'Toole tutorial

org-tutorials/index.org

@@ -34,7 +34,7 @@
 
 - [[file:orgtutorial_dto.org][The OrgMode tutorial]] by [[http://dto.freeshell.org/notebook/][David O'Toole]], covering the basics of TODO
   lists and the agenda.  It has been translated into [[file:orgtutorial_dto-fr.org][French]], [[http://hpcgi1.nifty.com/spen/index.cgi?OrgMode%2fOrgTutorial][Japanese]],
-  [[http://hokmen.chan.googlepages.com/OrgTutorial.en-cn.html][Chinese]], [[http://jmjeong.com/index.php?display=Emacs/OrgMode][Korean]], [[http://habrahabr.ru/blogs/emacs/105300/][Russian]] and [[http://deneb.iszt.hu/~pasztor/orgtutorial/notebook/orgtutorial-hu.html][Hungarian]].
+  [[file:orgtutorial_dto-es.org][Spanish]], [[http://hokmen.chan.googlepages.com/OrgTutorial.en-cn.html][Chinese]], [[http://jmjeong.com/index.php?display=Emacs/OrgMode][Korean]], [[http://habrahabr.ru/blogs/emacs/105300/][Russian]] and [[http://deneb.iszt.hu/~pasztor/orgtutorial/notebook/orgtutorial-hu.html][Hungarian]].
 
 - [[http://jaderholm.com/screencasts.html][A 25 minute screencast]] by [[http://jaderholm.com][Scott Jaderholm]], demonstrating the basic
   features of Org-mode.