localization/internationalization support generally runs unter the name L10N and I18N. Under Linux the gnu library gettext provides functions to translate strings from one language into other languages through a pregenerated database

In perl the library can be accessed through Locale::gettext for example. Another approach would be Locale::Maketext, the reasons for this more programmatic approach are detailed in Locale::Maketext::TPJ13

If you are lucky and have only fixed strings you could pregenerate the templates after any change to the templates, but normally you would have to add the translate step to your templating

PS: There is HTML::Template::Compiled::Plugin::I18N

UDPATE: You migh also want to read http://rassie.org/archives/247 for a critique of the Maketext approach

UPDATE: As dsheroh rightly commented it should be L10N, not I10N