Hi dolphix
Are you on a mac or pc?
I am running Quark 6.5 on Mac with OS 10.3.9, and I looked under Quark help and typed in "languages" and seems like I would need Quark PassPort to change languages within Quark.
However I can go to my system preferences and choose Turkish or another language from there, could that be your problem?
Hope this helps
IMacQuarker