Ooh, a linguistics story! For those who like a good linguistics story, you should check out the works of Juliette Wade. She's had 3 linguistics stories published in Analog over the last couple of years, one of which was published on StarShipSofa where you can listen for free:
http://www.starshipsofa.com/20100602/aural-delights-no-139-philip-k-dick-juliette-wade/I sent her an email to encourage her to submit here too.

I've been very impressed by her work.
Anyway, regarding this story:
I liked Luulianni and I felt that she was very relatable. I saw the twist of her supervisor stealing her work coming, but not in a bad way, as I still related to her struggle and the motive of the overlords to just delay the project was a new wrinkle.
I thought the details of the language translation were very interesting and they seemed like they made sense to my laymen's mind. It sounds like there's good reason for it not to have been translated since all of teh computer systems in the galactic alliance insisted on one particular character set that's not conducive to pictograms.
I thought the end dragged on a bit long. For me the real climax was the moment when she finally found the message. And then, without telling us what the message was, it tells us her reaction, the reaction of the overlords, the reaction of this and that and this and that, all without telling us the message. I found that too distracting, too much authorial intrusion, stringing me along when the character I've been following already knows the answer. I was starting to wonder if the message would be told to me at all when finally it was revealed.
The use of "homo sapiens" in the message felt out of place to me, because that phrase would mean nothing to these folks and was only in there to trigger to me what they were supposed to be. How do you depict a species name in pictograms? And why would you bother when you know it'll mean nothing to the recipients?
And so the grand message is
"We were lonely, therefore we destroyed the entire universe to make a better one. Now, instead of wandering around the universe looking for friends, you can be embroiled in constant interstellar wars. Hooray! Those species who survive the wars will thank us in the end. Remember us fondly. Sincerely, The Humans"
It WOULD be just like us humans to destroy all of existence because we considered its configuration to be inconvenient...