How can I get rid of en_US in Iceweasel?

[Michael Tsang <miklcct@gmail.com>]

I use the followings:

LANG=en_HK.UTF-8
LANGUAGE=en_HK.UTF-8:en_GB.UTF-8

I have *no* en_US.UTF-8 locales installed but Iceweasel always falls back to 
en_US. It's so frustrating. How can I completely prevent Iceweasel from using 
the en_US UI? I have zh_TW UI and en_GB UI installed. I want Iceweasel to use 
the en_GB UI instead of the en_US UI,
-- 
Please avoid sending me Word or PowerPoint attachments.
See http://www.gnu.org/philosophy/no-word-attachments.html

Attachment: signature.asc
Description: This is a digitally signed message part.