What Happened?

I came back after a while and found that not only was the whole UI is a different color scheme, some raspy bastard replaced the warm greeting of my dwarven friend and his chill tavern music. Not only that, arena gold, MY SHINY GOLD COINS, MY REWARDS FOR STRUGGLING IN THAT GOD FORSAKEN MODE IS GONE, REPLACED BY SOME DOG WATER PACKS.

p.s.: It would be greatly appreciated if someone could explain to me how to change the music and UI to its original form if possible, thanks in advance.