initdb.exe --pgdata=X:\MyDirForPgData --encoding='UTF8' --locale='uk_UA.UTF8' --lc-collate="Ukrainian_Ukraine.1251" --lc-ctype="Ukrainian_Ukraine.1251" --lc-messages="Ukrainian_Ukraine.1251" --lc-monetary="Ukrainian_Ukraine.1251" --lc-numeric="Ukrainian_Ukraine.1251" --lc-time="Ukrainian_Ukraine.1251"
http://www.sql.ru/forum/1059060/locale-v-instalyatore