Unfortunately there's an encoding problem with the Polish
translation in the gretl 1.9.8 release. This is fixed in the
current snapshots for MS Windows and OS X, and in addition
there's a new source package at
http://sourceforge.net/projects/gretl/files/snapshots/gretl-1.9.8cvs.tar....
These are marked as version "1.9.8cvs" but besides the version
string the only difference from the 1.9.8 release is the fixed
translation.
--
Allin Cottrell
Department of Economics
Wake Forest University, NC