Charset error game src

[kicsiasdvagyok 2]

Hello my friends!
I need very much help..
I'm working on the game source, and i can compile it whitout any errors.

After i have edited something in char.cpp;char_item.cpp, exchange.cpp, input_main.cpp , it look like had lost the original encoding.
Chinese letters have become everywhere.

Thanks in advance for any help!