NOTA IMPORTANTE se basa en que estamos usando los radiobuttons/checkboxes de CT Paper
$('input:radio[name="emailLang"][value="' + userCulture + '"]').radio('check');
$('input:radio[name="emailLang"]').on('toggle', function(){
var self = $(this);
var lang = self.val();
setFieldsContent(lang);
});
<label class="radio">
<input type="radio" data-toggle="radio" name="emailLang" value="ES">
<i></i> Español
</label>
<label class="radio">
<input type="radio" data-toggle="radio" name="emailLang" value="EN">
<i></i> English
</label>
<label class="radio">
<input type="radio" data-toggle="radio" name="emailLang" value="PT">
<i></i> Português
</label>