SIR PLSS! need Help

sir i got your files from youtube the v19 flyff with source and client. but i'm having trouble with the language in the client. i can't change the language. whenever i change the res files with the flyff.a in the client using the merge2 inside your resource for changing words from worlddialog.txt.txt or any .txt.txt. the neuz.exe will automatically close. i don't know what to do next. help me about my problem sir. thank you.