Alright, here's what they say:
He's shouting "Argh!" split over three frames. Not sure how one would go about imitating that with roman letters... (the rightmost one should be the one actually displayed first in the game, the one in the middle last)
This reads "Very disappointed look." ("Disappointed look" should be enough for the translation, in case it's hard to fit inside the bubble) That's the one I had seen in the game.
Yep, I think "Completion" would be better for the translation, as the percentage also includes optional sidequests.
We don't really need to edit this either way, since it just spells the town's name in Hangeul.
Btw., are we now also able to change the size of the original "Items" window in battle? I could modify that one myself (as it's just a job of cropping and pasting multiple copies of it together so that they fit) if you can rip and upload it.
And yeah, I tried meddling with one of those images posted here, and the results didn't look good. So if someone more talented is willing to contribute, please do.