Translating so in ContactPage.php
// Create fields
$fields = new FieldSet(
new TextField('Name',"_t('ContactPage.NAME');"),
new EmailField('Email',"_t('ContactPage.EMAIL');"),
new TextareaField('Comments',"_t('ContactPage.COMMENT');")
);
// Create action
$actions = new FieldSet(
new FormAction('SendContactForm', "_t('ContactPage.SEND');")
);
using this in lang file:
$lang['et_EE']['ContactPage']['NAME'] = 'Teie nimi:';