Reference probrem and Japanese locale

[Isamu Yamamoto]

Hello.

I use horde-1.2.3 and imp-2.2.3.
References: and In-Reply-To: disappears when the file is appended
when replying to mail. 

How should I do though I want Japanese locale file to be added to IMP?
 Isamu Yamamoto     yamamoto@trustbee.com
                    yamamoto-ml@trustbee.com