[Zope] How to support Chinese Characters in ZMI?

Hi, I find that the ZMI doesn't support Chinese very well. I type some chinese characters in the ZMI, and after "save change", the characters didn't display well. The default charset for ZMI is "ISO-8859" which doesn't support Chinese. I want to change it to "UTF-8" to support Chinese. My zope version is 2.6.4 and i don't want to upgrade to 2.7. Is there some way to solve the problem in v2.6? Thanks in advance!