Damn! I comment out encoding definition and was very surprised that it does not work:-)).

CVS version numbers

russian/po/distrib.ru.po: 1.5 -> 1.6

russian/po/distrib.ru.po

-# msgid ""
-# msgstr ""
-# "Content-Type: text/plain; charset=koi8-r\n"
-# "Content-Transfer-Encoding: 8bit\n"
+msgid ""
+msgstr ""
+"Content-Type: text/plain; charset=koi8-r\n"
+"Content-Transfer-Encoding: 8bit\n"
 
 #: ../../english/distrib/search_contents-form.inc:7
 #: ../../english/distrib/search_packages-form.inc:7