You can't get the "Kill 10 Asmodian Officers" quest without changing language pack.
Well Rounded [Elyos Miragent]
I picked Cooking for the test, the npc will tell you to go talking to the Cooking Master. But the quest updates itself and points toward the weaponsmith NPC.
[Spy/Group] A Many-Splendored Ring
another quest you have to switch to korean to get
Did they ever fix the Asmo Daevanian (30) quest? Last I heard you had to change languages.
For Elyos quest [Group] Marana's Worry, it tells you to kill Pointy Ear Fangwing, but it is dropped from Long-Eared Fangwing.
For a lot of the "kill certain monster" quests (Like the worgs), locating helps to find the right one.
Yes, the daevanion exchange works now, along with most of the more commonly encountered "have to change to korean" quests like the one in red mane, and the ones for kurngalfberg protector's stuff.