I found answer
Documentation defines that properties file encoding is ISO-8859-1.
see http://java.sun.com/j2se/1.5.0/docs/api/java/util/Properties.html
Characters that cannot be directly represented in this encoding can be written using Unicode escapes ; only a single 'u' character is allowed in an escape sequence. The native2ascii tool can be used to convert property files to and from other character encodings.
So, cyrillic characters should be written like \u041a\u0440\u0430\u0441\u0430\u0432\u0447\u0435\u0433
unicode table http://www.orwell.ru/test/CP/_?cp1251
Or you can use ListResourceBundle
import java.util.*;
public class Udaff_ru_RU extends ListResourceBundle {
public String[][] getContents() {
return contents;
}
private String[][] contents = {
{ "a", "Превед" },
{ "b", "Красавчег"},
{ "c", "Учаснег" }
};
}