Developer Area/Core Subsystems/Form API (Pieforms)/Form API i18n
From Mahara Wiki
Form rules can be internationalised to different languages. This is still a work in progress, but basically either a rule can export a function named
form_rule_$rulename_i18n that returns a language string, or they can mash it into the Form class itself. Nigel still has to add support for getting strings from elsewhere, if necessary.