Game is suddenly in Korean language

[Jelima]

Hello
for days now I have the problem that my game is in Korean, I mean everything. Quests, settings, etc. How can I change this? I first had the problem that I had to reinstall it and there came the error Replace me, after several times uninstall and reinstall this error has resolved, but then came now that with the language. 
Gladly I would continue to play the game, after all, I also pay for the Siel's Aura, monthly. 

I would appreciate any quick help or tips.