I managed to install East Asian Language support to my BlackBerry 8900 Curve. I have been searching through lots of posts in order to find out how to just install the language support without upgrade the OS, and finished my installation without any heart attack, so I will share my installation steps here to save some effort if anybody needs it.
You can remove unwanted input after installation, e.g. I only keep Chinese input. To switch between input languages, press Entre while holding down Alt key.
For full installation details and screen shots, please look at this Knowledge Gene - [link: 'Install East Asian Language Support for BlackBerry 8900']
You can export the KGene and document using the pdf export icon, or hover over the first knowde, then click 'Learn more', navigate through the KGene, or click 'Show Full Document' to view the full doc :-)
Below is the outline steps:
1. Download Multi Language OS
For my 8900 Curve, I downloaded the 8900-v184.108.40.206_P220.127.116.11 version of OS.
2. Install the downloaded OS to your PC, you will need the files from this new OS later on to add multi language support to your BlackBerry device.
A new 8900-v18.104.22.168_P22.214.171.124 folder will be created under C:\Program Files\Common Files\Research In Motion\Shared\Loader Files.
The CJK.alx is the file we need to use later on.
3. Use Desktop Manager to backup your BlackBerry
Just in case... ^__^
4. Use AppLoader to add extra language support to BB.
Before the installation, go to your AppLoader folder, e.g. C:\Program Files\Common Files\Research In Motion\AppLoader, move the Vendor.xml to a backup directory, so you have kept a copy of the file.
Use the loader.exe to load up the AppLoader, follow the wizard, you will be able to add the CJK.alx file to the list at some point and select the desire languages.