Xprint on Solaris using "C" locale

I'm trying to get Mozilla properly configured for my users on Solaris 8.
One of the main issues is printing not working.  I finally tracked it down
to the $LANG variable being set to "C" instead of en_US or something
similar.   With it set to "C", they see all metric paper sizes, margins,
etc., and the printers seem to choke on the jobs.  

I have tested it on some others that use en_US (8859-1 or similar) and the
print jobs work fine.  What is the easiest or best way to get all
instances of mozilla to use one LANG setting? I've tried putting it into a
wrapper script, but Mozilla still seems to ignore it.

Mozilla 1.6
Solaris 8

Thanks