Become superuser or assume an equivalent role.
Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.
Remove the packages for the locale installed on your system using the localeadm command. The -r option and a locale identifies the locale that you want to remove from the system. To remove the Central European region (ceu) from your system, for example:
# localeadm -r ceu locale/region name is ceu Removing packages for Central Europe (ceu) . . . One or more locales have been removed. To update the list of locales available at the login screen's "Options->Language" menu, . . .