Делаю сайт мультиязычным,есть веб-форма кастомная с текстами в input(типа "Время окончания аренды*","Номер телефона*"), ,как сделать так чтобы они переводились на английский,весь остальной контент переводится хорошо.
помогите,люди добрые!
внизу кусок кода

function theme_custom_form_theme_function($variables){
$form = $variables['form'];
global $language;
$ln = $language->language;
$output = '';
$form['field_date_of_commencement_of_th']['und'][0]['value']['date']['#value'] = "";
$form['field_date_of_commencement_of_th']['und'][0]['value']['date']['#title_display'] = "invisible";
$form['field_date_of_commencement_of_th']['und'][0]['value']['date']['#description'] = "";
$ln = 'en' ? $date = 'Date' : $date = 'Дата начала аренды*';
$form['field_date_of_commencement_of_th']['und'][0]['value']['date']['#attributes']['placeholder'] = $date;

$form['field_date_of_commencement_of_th']['und'][0]['value']['time']['#value'] = "";
$form['field_date_of_commencement_of_th']['und'][0]['value']['time']['#title_display'] = "invisible";
$form['field_date_of_commencement_of_th']['und'][0]['value']['time']['#description'] = "";
$form['field_date_of_commencement_of_th']['und'][0]['value']['time']['#attributes']['placeholder'] = "Время начала аренды*";

$form['field_ending_date_of_the_lease']['und'][0]['value']['date']['#value'] = "";
$form['field_ending_date_of_the_lease']['und'][0]['value']['date']['#title_display'] = "invisible";
$form['field_ending_date_of_the_lease']['und'][0]['value']['date']['#description'] = "";
$form['field_ending_date_of_the_lease']['und'][0]['value']['date']['#attributes']['placeholder'] = "Дата окончания аренды*";

$form['field_ending_date_of_the_lease']['und'][0]['value']['time']['#value'] = "";
$form['field_ending_date_of_the_lease']['und'][0]['value']['time']['#title_display'] = "invisible";
$form['field_ending_date_of_the_lease']['und'][0]['value']['time']['#description'] = "";
$form['field_ending_date_of_the_lease']['und'][0]['value']['time']['#attributes']['placeholder'] = "Время окончания аренды*";

$form['field_your_name']['und'][0]['value']['#value'] = "";
$form['field_your_name']['und'][0]['value']['#title_display'] = "invisible";
$form['field_your_name']['und'][0]['value']['#description'] = "";
$form['field_your_name']['und'][0]['value']['#attributes']['placeholder'] = "Ваше имя*";

$form['field_your_e_mail']['und'][0]['value']['#value'] = "";
$form['field_your_e_mail']['und'][0]['value']['#title_display'] = "invisible";
$form['field_your_e_mail']['und'][0]['value']['#description'] = "";
$form['field_your_e_mail']['und'][0]['value']['#attributes']['placeholder'] = "Ваш e-mail*";

$form['field_telephone_number']['und'][0]['value']['#value'] = "";
$form['field_telephone_number']['und'][0]['value']['#title_display'] = "invisible";
$form['field_telephone_number']['und'][0]['value']['#description'] = "";

$form['field_telephone_number']['und'][0]['value']['#attributes']['placeholder'] = "Номер телефона*";

$form['field_comments']['und'][0]['value']['#value'] = "";
$form['field_comments']['und'][0]['value']['#title_display'] = "invisible";
$form['field_comments']['und'][0]['value']['#description'] = "";
$form['field_comments']['und'][0]['value']['#attributes']['placeholder'] = "Комментарий";

$form['field_date_of_commencement_of_th']['und'][0]['value']['time']['#id'] .= '-custom';
$form['field_date_of_commencement_of_th']['und'][0]['value']['date']['#id'] .= '-custom';
$form['field_ending_date_of_the_lease']['und'][0]['value']['date']['#id'] .= '-custom';
$form['field_ending_date_of_the_lease']['und'][0]['value']['time']['#id'] .= '-custom';

$output .= '

';

$output .= '

' . drupal_render($form['field_equipment']['und']['Motorcycle Honda GoldWing 1800']);
$output .= '

' .drupal_render($form['field_equipment']['und']['Tricycle Honda GoldWing 1800']);

$output .= drupal_render_children($form);

$output .= drupal_render_children($form);
$output .= '

';

return $output;
}