Missing character set

[Yang Shouxun <yangsx@fltrp.com>]

In the last few days, I found my gtk/gnome apps cannot display the menus
in Chinese correctly. They used to be correct before and I didn't change
anything, except I regularly update with apt-get dist-upgrade.

I can verify that these fonts exist with "xlsfonts".

Below is error message found in ".xsession-errors":

----8<----
The font "-adobe-times-medium-r-normal--16-*-*-*-*-*-*,
		  -default-song-medium-r-normal--16-*-*-*-*-*-*-*,
		  *-r-*" does not support all the required character sets for the current
locale "zh_CN"
   (Missing character set "ISO8859-1")
   (Missing character set "GBK-0")
----8<----

Any comments and suggestions are welcome!