I'm very interested in internationalization of OpenACS and dotLRN.
I don't know how was gp-lang done or how it does just job (is this published somewhere?), but I haven't heard anything of using something like GNU's gettext (i18n library).
gettext's documentation is very well done, and it covers many issues of i18n. Many free software developers are already familiar with it and many languages already support it.
