svnadmin upgrade output message i18n issue

os: windows
encoding:GBK ( chcp 936 )

The svnadmin upgrade command output message first line encoding
issue(UTF-8 show in GBK),But the second line is right encoding!

已取得版本库锁定�?请稍候；升级版本库可能需要一段时�?..

���������

if change console encoding to UTF-8 (chcp 65001),output message is :

Repository lock acquired.
Please wait; upgrading the repository may take some time...

Upgrade completed.
Received on 2013-05-23 07:16:30 CEST