[Koha] Koha import cyrillic

Dear community, We would like to install KOHA library automation system for a library in Kazakhistan. We need ISO 5427 character set while importing records. We exported unimarc records from former library automation. But records are in cyrillic encoding (ISO 5427). In KOHA marc import page (web) (after uploading file in "character encoding" section) there is no ISO 5427 option. We tried other character encoding options. But we encountered weird characters on the screen. Is there any way to add ISO 5427 option to character encoding section. Volkan Sönmez Süleyman Demirel University Library (phone) +90 (246) 2118154