Here is an example of finding out what you are set to presently :
bash-3.00$ pkginfo | grep -i SUNWloc
systemSUNWloc System Localization
systemSUNWlocaledefsrcEMEA localedef source files
bash-3.00$ locale
LANG=C
LC_CTYPE=C
LC_NUMERIC="C"
LC_TIME="C"
LC_COLLATE="C"
LC_MONETARY="C"
LC_MESSAGES="C"
LC_ALL=C
You should be able to find the SUNWloc package on the dvd.