Turkish 'I's can't D either

[Walter Bright]

I think it's great that you're doing a Turkish programming tutorial! I 
can't help you, though, with details of the Turkish language because I 
have no idea how it works.

The only thing I can suggest is using a setlocale for Turkish is the 
wrong way, as Unicode was supposed to get away from that.

tolower really is only for ASCII. But the toUniLower should work right 
with Turkish, though I don't know what right is for that case.