Now my second char is lvl 31 and it is funny:
German client Quest "Toten für Castor" (german word "töten"="killing")
Kill 9 mobs.
If you take the german quest, and then log off and relog with the english client. You have in "J"
the english quest "Killing for Castor", and you have to kill 10 mobs (4 basilisk / 6 kselids)
If you kill in the german version the 9 mobs, the counter did not count correctly, but you get the quest finished after 9 kills.