Replying to UTF-8 message causes switch to Esperanto language. Why?

[Eliseev Vladimir <evlad cge ru>]

Hello,

I discovered the problem with default language setting while replying to message encoded in UTF-8.  Usually ny default language is Russian(KOI8-R)  but it magically switches to Esperanto when I want to reply to the message like this:

Date: Wed, 3 Dec 2003 09:50:57 +0500
User-Agent: KMail/1.4.3
Cc: =?utf-8?b?0JXQu9C40YHQtdC10LIg0JLQu9Cw0LTQuNC80LjRgA==?= <evlad@cge.ru>
MIME-Version: 1.0
Content-Type: Multipart/Mixed;
  boundary="------------Boundary-00=_XSYA0XXTSEXSIZL3KV25"
Status: RO
Content-Length: 580333
Lines: 7552

--------------Boundary-00=_XSYA0XXTSEXSIZL3KV25
Content-Type: text/plain;
  charset="utf-8"
Content-Transfer-Encoding: 8bit


My balsa 2.0.15 works on SPARC/Solaris 8.
Any comments?  Or maybe all is ok?

Best regards,
                        Eliseev Vladimir