in german version you have to stand near the wall behind the woman and press the S-Button -> https://www.youtube.com/watch?v=cVVtfwiLrwI

You have to sit on the bench under the staircase on the first floor and Eavesdrop. (default key F1)

Quest makes no sense how complete it dumped this quest as well.

I have added a pic as to where you sit for this quest in the NA server, but I am waiting for the moderators to okay the pic and hopefully they will add it. Thanks to Xenosuke though, I did work out where to sit. Basically you will see the 3 guys standing and sort of jousting, and then you will see a table beside them where there are 2 people sitting and a little person standing next to the table. There is a bench on the other side of that table where you sit and then you can eavesdrop on their conversation. As soon as you press F5, the quest should complete!! :-)

要在一樓偷聽而不是指向的二樓,在有兩個盾牌下面,有個撅屁股的女人身後靠牆F5就可以ㄌ