from view-source:https://www.healthcare.gov/ lines 1538 - 1551

gistfile1.js

// What?
    if ('en' == 'es') {
        langCode = 'es_MX';
        var url = window.location.href.replace('cuidadodesalud.gov','healthcare.gov').replace('/es/','/');
        $('.span1 a.btn-mini.btn-lang, #header .lang').removeClass('nodisplay').attr('href', url);
    }
// What what?
    if ('en' == 'en') {
        langCode = 'en_US';
        if (''.length > 0) {
            var url = window.location.href.replace('','/es');
        } else {
            var url = window.location.protocol + '//' + window.location.host + '/es' + window.location.pathname + window.location.hash;
        }
        $('.span1 a.btn-mini.btn-lang, #header .lang').removeClass('nodisplay').attr('href', url);
    }