Plesk 7.5.6 Language Pack Problem

[adilalpman]

I have just installed Turkish Language Pack that downloaded http://download1.swsoft.com/Plesk/Plesk7.5/Extensions/lp/plesk_7.5.6_languagepack_060303.15_tr.msi adress, then i have restarted my plesk's all services from plesk service manager that located near the system clock, but while i open my plesk's login page via my browser i cant see "Turkish" in Language drop down menu. Installation didnt retrive any error message while i set it up...