Ratbag,
I checked the Latin, and it seems that fori is the plural form. I wasn't so sure, so didn't want to post it, but since you did, so can I. As for the translation, after asking the two people in the world who have worked on this thing in my field, I contacted this American woman who wrote her MA thesis on it, and included a translation. Hopefully, I have persuaded her to send me a copy electronically. if not, I'll have to order up her thesis and simply copy it all on to my computer.
So, hopefully I'm set.