As described in the article Aert posted, you can add this filter. This will be part of the free plugin as of 3.0.0, released in 2-3 weeks.

function cmplzf_register_translation($fieldname, $string)
{
    //polylang
    if (function_exists("pll_register_string")) {
        pll_register_string($fieldname, $string, 'complianz');
    }

    //wpml
    if (function_exists('icl_register_string')) {
        icl_register_string('complianz', $fieldname, $string);
    }

    do_action('wpml_register_single_string', 'complianz', $fieldname, $string);
}
add_action('cmplz_register_translation', 'cmplzf_register_translation', 10, 2);