Hi Emre,

It doesn't look like it

Turkish Language Support

Cisco Unified Communications Manager Release 6.1 supports Turkish locales on Cisco Unified
Communications Manager user interfaces and Turkish text on phone screen displays for the following
Cisco Unified IP phones.

Supported Cisco Unified IP Phones (SCCP and SIP)
7975G, 7971G-GE, 7970G, 7965G, 7962G, 7961G-GE, 7961G, 7945G, 7942G, 7941G-GE, 7941G,
7931G (SCCP only)

http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/rel_notes/6_1_1/cucm-rel_note-611b.pdf

Hope this helps!

Rob