This quest was marked obsolete by Blizzard and cannot be obtained or completed.
Find someone who can translate the paladin's journal. The closest location that might have someone is Kargath, in the Badlands.
At an impasse of sorts, you know that you will need the book translated into a language you can understand. There certainly are a number of people in the world who could do it; the closest location that might have someone who could, however, is the Kargath outpost in the Badlands. Perhaps that is a good place to start.