Implements hook_form_FORM_ID_alter().
function translation_entity_form_field_ui_field_edit_form_alter(array &$form, array &$form_state, $form_id) {
$field = $form['#field'];
$field_name = $field['field_name'];
$translatable = $field['translatable'];
$label = t('Field translation');
$title = t('Users may translate this field.');
$form['field']['#collapsed'] = $translatable;
if (field_has_data($field)) {
$path = "admin/config/regional/translation_entity/translatable/{$field_name}";
$status = $translatable ? $title : t('This field has data in existing content.');
$link_title = !$translatable ? t('Enable translation') : t('Disable translation');
$form['field']['translatable'] = array(
'#prefix' => '<div class="translatable"><label>' . $label . '</label>',
'#suffix' => '</div>',
'message' => array(
'#markup' => $status . ' ',
),
'link' => array(
'#type' => 'link',
'#title' => $link_title,
'#href' => $path,
'#options' => array(
'query' => drupal_get_destination(),
),
'#access' => user_access('toggle field translatability'),
),
);
}
else {
$form['field']['translatable'] = array(
'#prefix' => '<label>' . $label . '</label>',
'#type' => 'checkbox',
'#title' => $title,
'#default_value' => $translatable,
);
}
}