If you come back......this works:
// Change this to localize WordPress. A corresponding MO file for the
// chosen language must be installed to wp-includes/languages.
// For example, install de.mo to wp-includes/languages and set WPLANG to 'de'
// to enable German lanuage support.
define ('WPLANG', 'sv');
/* Stop editing */
and the file
It's the same advice as I gave here:
so all I can guess at now is that the theme you have is not correctly written to accept localisation.