This feature is new in the Solaris Express 7/04 release. Additional locales were added in the Solaris 9 9/04 release and in the Solaris 10 3/05 release.
The following Unicode locales have been added to Solaris:
nl_BE.UTF-8 (Belgium Flemish)
ar_SA.UTF-8 (Saudi Arabia)
cs_CZ.UTF-8 (Czech Republic UTF-8)
cs_CZ.UTF-8@euro (Czech Republic UTF-8 + Euro)
hu_HU.UTF-8 (Hungary UTF-8)
The new locales are available from system login.