[imp] Chinese folder name display problem

[David Chang]

Hello everyone:
Folders that created in IMP,outlook or netscape messager with Chinese name
 did not display correctly in IMP,except outlook & netscape messager .

For outlook express screenshot:
http://210.241.49.67/~txg16/tmp/ol.jpg

For Netscape messager:
http://210.241.49.67/~txg16/tmp/nm.jpg

For IMP:
http://210.241.49.67/~txg16/tmp/imp.jpg


Related config are:
horde/config/nls.php
$nls['conf']['enable_utf'] = false;

IMAP Server are : cyrus-imapd-2.1.12

You can test my horde here:
http://210.241.49.70/horde.beta/test.php