I felt the same yesterday, but I gave it an hour or two and found enough of the clues much easier to cold-solve than they often are, enabling me to get the translator. Once I had him the rest of the hidden message was easy as it seems the work in question is the only thing for which he is (although not to me) famous. Filling the grid was straightforward given the two 12-letter answers. And that is where I'm stuck. I can replace two of the entries with two of the extras, but the other two defeat me. I'd be interested to hear how others have completed the end game.