I took these files off the 9700 EastAsia_v5.0.0.351_P5.1.0.98 build...
Paste the COD files to: C:\Program Files\Common Files\Research In Motion\Shared\Loader Files\(Your OS)\Java
and copy the alx file to: C:\Program Files\Common Files\Research In Motion\Shared\Loader Files\(Your OS)\
When you run apploader, you should be able to choose the east asian language support for the install.
I tried installing the files on .405 & .415.. only font support works, the pinyin input support is'nt working, if anybody have a fix please let me know..
DOWNLOAD LINK