For the Piins i18n Smarty plugin go and visit the [Piins blog], the blog about the [first Piins OS release: Smarty i18n] or the [tutorial site for Smarty and i18n]. It has full support for gettext and Smarty variables. Comments are heartily welcome.
Download the latest version at: http://sourceforge.net/projects/smarty-gettext/
Discuss at: http://sourceforge.net/forum/?group_id=107853
Copy of the README:
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those interested in something that compiles the translations should take a look at IntSmarty??. This is good for those of us who cannot cache our translated pages but would still like to save processor time.