There is no one who can add to the original software for the Turkish language?
If you go to Settings -> Language & keyboard -> Select Language you can select Turkish as the language.
Do what m4xm4n told you to with the prior version. That's the capability. If it's not enough, request it get added to the base on the CyanogenMod forums, it's not something that these developers would be doing.
Unrelated to the Turkish language... any change of getting the Kernel 'type' changed to galaxys4g instead of galaxys4gmtd so that phone model detection bits (like Voodoo Plus) will actually work without recompiling additional custom kernels?