This language support enhancement is new in the Developer 9/07 release.
Locale Creator is a command line and Graphical User Interface tool which enables users to create and customize Solaris locales. This tool enables users to create installable Solaris packages containing customized locale data of a specific locale. Once the created package has been installed, the user has a fully working locale available on the system. For more information, see:
Run the command /usr/bin/localectr -h
localectr man page
http://developers.sun.com/global/products_platforms/solaris/reference/techart/locale-creator.html