I had - and still have, for that matter - the original Freespace double pack back from 2003ish (in German). The first time I was scrounging around on HLP, which has to be quite a cpl of years ago, there were still dubious links floating around here that made me manage to grab a .vp file for English voice and briefings. Still, all tables not altered by the SCP, the main menu and the HUD where in German when I dug out my Freespace data about two weeks ago (I still had the 3_6_9 build, go figure out how old it was) and went over the routine again to get everything going. I still had the english voice files as well, but like then, everything else written and not modified, was still German. So just 3 days ago, I went to GoG and bought another copy, this time in full fledged english. Just to be able to copy some tables over.
About five bucks isn't the world. And if it is for the Freespace series, I would have gladly paid the retail price again just to support this software jewel. Well not necessarily gladly, because it would have been a ripoff, but I still would've bought it.
Long story short: Even if it is just a cpl of minor files, go and grab another copy. It would have been nicer if there was an official language- and voicepatch, but unfortunately, for such an old game (and for most other games, for that matter) there isn't.