Captain,you can't translate the quests and the NPC dialogue.Client doesn't have those texts.In quests.bin you can find only the code for the quests' texts..Client sends these codes to the server and requests the text for each quest.They dissapear after you exit the game.If you completed about 30 quests so far,check the "Completed quests" button.You will have lag a little bit.On 150 or more quests completed the lag is bigger.Because you are requesting and then downloading more data from the server.I was looking for the quest texts and NPC dialogue for a long time too

Mob names don't appear even in quests counter,this makes the quests more difficult to complete if you use the monster.bin translated into English.