the Jester
Legend
I also want to ask the OP directly: If you were getting frustrated (and the players were too), why wouldn't you just give them an "out of character" nudge in the right direction? Why opt to have a bad session instead of just saying, "Look, guys, things aren't going the way I thought they would. It would help me out a lot if one of you would just translate those papers." You're all playing a game together; they'll help you out of a tight spot in order to get things going. Won't they?
D00d.
I would never do this as a dm, although I'll remind my group of things that they have forgotten.
As a player, DM nudges to stay on the tracks just make me want to derail the train more. Granted, I'm pretty reactive when it comes to attempts by the DM to dictate what I do, so I might be overreacting a bit, but DM 'suggestions' on how to further the 'plot' make me want to light the whole damn campaign on fire.