Update Korean Translation and correct grammar pls!
Update Korean Translation and correct grammar pls!

Not good:        Updated trnaslations with missremoved strings and added a new string.
At least better: Updated translations with misremoved strings and added a new string.
violine1101/MCEdit-Unified,fhfuih/MCEdit-Unified,DragonQuiz/MCEdit-Unified,skinny121/MCEdit-TallWorlds,skinny121/MCEdit-Unified,gpmidi/MCEdit-Unified,fhfuih/MCEdit-Unified,Khroki/MCEdit-Unified,Neui/MCEdit-Unified,gpmidi/MCEdit-Unified,violine1101/MCEdit-Unified,DragonQuiz/MCEdit-Unified,skinny121/MCEdit-TallWorlds,gpmidi/MCEdit-Unified,OniOniOn-/MCEdit-Unified,DragonQuiz/MCEdit-Unified,fhfuih/MCEdit-Unified,skinny121/MCEdit-TallWorlds,OniOniOn-/MCEdit-Unified,Khroki/MCEdit-Unified,OniOniOn-/MCEdit-Unified,Neui/MCEdit-Unified,skinny121/MCEdit-Unified,Khroki/MCEdit-Unified,Neui/MCEdit-Unified