Hmm... I don't have an original FS 1 or 2 install disks (FS2 PL might be in one of my cousins hands), so i think only thing i can do is providing you with VP files (PL version, of FS1) or helping to translate something.
Still, i have to write, that in Polish version of FS1 some (or many) dialogues sound... well, bad at least. Some sound like Ivona (if you know what i mean).
Btw, from what i read here, i concluded, that HLP "purchased" copyright for FS games. Does that mean HLP will be able to distribute Freespace by Internet (download installation ISO for example)?