I actually got the information about the original script from an interview with Femi Taylor who played Oola in the film. Here's the site:
Not sure about her trying to escape. I mean her chain is actually literally locked to the throne. It only unlocked when Jabba pressed the button. One of the source books has something about Jabba' throne and I'm pretty sure it said something about how his the switch on his throne simultaneously opens the trapdoor and releases the chain. Oola, however might not have known this.
As far as translations go, your right there is nothing official as far as I know. There is a huttese dictionary online (completewermosguide.com) but most of the words they were speaking either don't appear or too hard to make out. The only one we know is "Da Eitha" which means "come here" in huttese.