Locale Creator is a command line and graphical user interface tool that enables users to create and install Solaris locales. Using locale creator users can create installable Solaris packages containing customized locale data of a specific locale. After the created package has been installed, the user has a fully working locale on the system.
For more information, see the following:
The command /usr/bin/localectr -h
localectr man page
http://developers.sun.com/global/products_platforms/solaris/reference/techart/locale-creator.html