[TYPO3] Set up the correct EXT language label for non English website

[rocky Ou]

Hey List,

I'm developing a Chinese website using TYPO3. I have been able to set 
the default language to Chinese. I have localized Chinese labels in the 
extensions' locallang.php. I have made the 
TYPO3_CONF_VARS['BE']['forceCharset'] to be utf-8. The problem is that 
the extension labels shows the unreadable code but the menu and other 
part shows the correct Chinese characters.

Can any of you help me please?

Blessings,
Rocky