i18n doc patch

Hi,

This patch enables the use of translated manuals for pgAdmin on the official
website. It simply checks the availability of the displayed file for the
choosen lang and defaults to en_US if it doesn't.

It seems to work on this URL:
  http://wwwdevel.pgadmin.org/docs/dev/bugreport.html?lang=fr_FR

It doesn't on the other files because they aren't already available in the
svnrepo folder.


--
Guillaume.
 http://www.postgresqlfr.org
 http://dalibo.com