Form API: Form field not being translated

Question

I'm implementing a gender field in a custom registration form.

The gender field also exists as a user field, so I'd like to call the label and allowed values from the existing instance. I've written it as a conditional override just in case...:

$form['gender'] = array(
    '#title' => t('Gender'),
    '#type' => 'radios',
    '#options' => array('female' => t('Female'), 'male' => t('Male')),
    '#required' => TRUE,
);
if($field = field_info_field('field_gender')) {
    $form['gender']['#options'] = $field['settings']['allowed_values'];
    $info = field_info_instance('user', 'field_gender', 'user');
    $form['gender']['#title'] = t($info['label']);   
}

Everything's working great, except for the multilingual part: despite having translated the field instance at the admin account settings using i18n, the extracted options and title of the existing field are not being translated upon changing the front-end language. They DO get translated however when visiting the user account page in a different language.

It seems my custom form doesn't send its strings through i18n...?

Can anyone point me out the pitfall please?

Thanks

UPDATE

I used

$func = function($val) { return t($val); };
$form['gender']['#options'] = array_map($func, $field['settings']['allowed_values']);

as suggested by Shameem to translate the options. But now it seems t() is fetching translations from the Locale module repository. How to direct t() to fetch it from i18n?

Answer 1

I managed to set up a working solution. Could somebody possibly point out please if it is actually good practice to use those i18n functions per direct in the code?

    $form['gender'] = array(
    '#title' => t('Gender'),
    '#type' => 'radios',
    '#options' => array('female' => t('Female'), 'male' => t('Male')),
    '#required' => TRUE,
);
if($field = field_info_field('field_gender')) {
    $instance = field_info_instance('user', 'field_gender', 'user');    
    $form['gender']['#title'] = 
        module_exists('i18n_field') ? i18n_field_translate_property($instance, 'label') : t($instance['label']);   
    // Define this t() function for the array_map just in case i18n_field isn't enabled.
    $func = function($val) {
        return t($val);
    };
    $form['gender']['#options'] = 
        module_exists('i18n_field') ? i18n_field_translate_allowed_values($field) : array_map($func, $field['settings']['allowed_values']);
}

Answer 2

the field options are not going through the t function.

you would need to take each value from the following array and make it go through the t() function

$field['settings']['allowed_values'];

and please check that $info['label'] is a plain text and not an array.