It would be more easier to do a quest if we had a Quest Log/Box/Information that would clarify on a bigger screen what we needed to do for the quest. Like the simple UI to the right where it briefly indicates what you have to do is a great way to simplify the quests for people who easily understand what to do.
But if some people are not as great at English, having trouble understanding what the quest is saying you have to do, wants to tripple check what the quest is about, I think it would be more convenient if you added a Quest Window along side the Quest simplifier/summary UI at the right side of the screen.
I think what you already have for the Quest UI is great for native english speakers and people that excel at comprehending English, but I believe adding a little more help for other people is great since this game is international and alot of people who aren’t great at English would like to play the English version of the game.