first import

sites/all/modules/i18n/i18n_contact/i18n_contact.i18n.inc

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+<?php
+/**
+ * @file
+ * Internationalization (i18n) hooks
+ */
+
+/**
+ * Implements hook_i18n_string_info().
+ */
+function i18n_contact_i18n_string_info() {
+  $groups['contact'] = array(
+    'title' => t('Contact forms'),
+    'description' => t('Configurable contact form categories.'),
+    'format' => FALSE,
+    'list' => TRUE,
+  );
+  return $groups;
+}
+
+/**
+ * Implements hook_i18n_object_info().
+ */
+function i18n_contact_i18n_object_info() {
+  $info['contact_category'] = array(
+    // Generic object title.
+    'title' => t('Contact category'),
+    // The object key field.
+    'key' => 'cid',
+    // The object load callback.
+    'load callback' => 'contact_load',
+    // Placeholders for automatic paths.
+    'placeholders' => array(
+      '%contact' => 'cid',
+    ),
+    // To produce edit links automatically.
+    'edit path' => 'admin/structure/contact/edit/%contact',
+    // Auto-generate translate tab.
+    'translate tab' => 'admin/structure/contact/edit/%contact/translate',
+    // Properties for string translation.
+    'string translation' => array(
+      // Text group that will handle this object's strings.
+      'textgroup' => 'contact',
+      // Object type property for string translation.
+      'type' => 'category',
+      // Table where the object is stored, to automate string lists
+      'table' => 'contact',
+      // Translatable properties of these objects.
+      'properties' => array(
+        'category' => t('Category'),
+        'reply' => t('Auto-reply'),
+      ),
+      // Path to translate strings to every language.
+      'translate path' => 'admin/structure/contact/edit/%contact/translate/%i18n_language',
+    )
+  );
+  return $info;
+}

sites/all/modules/i18n/i18n_contact/i18n_contact.info

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+name = Contact translation
+description = Makes contact categories and replies available for translation.
+dependencies[] = contact
+dependencies[] = i18n_string
+package = Multilingual - Internationalization
+core = 7.x
+
+; Information added by drupal.org packaging script on 2013-01-13
+version = "7.x-1.8"
+core = "7.x"
+project = "i18n"
+datestamp = "1358075001"
+

sites/all/modules/i18n/i18n_contact/i18n_contact.module

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+<?php
+/**
+ * @file
+ * Internationalization (i18n) submodule: Multilingual contact forms
+ *
+ * @author Jose A. Reyero, 2005
+ */
+
+/**
+ * Implements hook_menu().
+ *
+ * Add translate tab to contact config.
+ */
+function i18n_contact_menu() {
+  $items['admin/structure/contact/edit/%contact/edit'] = array(
+    'title' => 'Edit',
+    'type' => MENU_DEFAULT_LOCAL_TASK,
+    'weight' => -100,
+  );
+  return $items;
+}
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function i18n_contact_form_contact_category_delete_form_alter(&$form, &$form_state) {
+  $form['#submit'][] = 'i18n_contact_form_contact_category_delete_form_submit';
+}
+
+/**
+ * Remove strings for deleted categories.
+ */
+function i18n_contact_form_contact_category_delete_form_submit(&$form, $form_state) {
+  i18n_string_object_remove('contact_category', $form['contact']['#value']);
+}
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function i18n_contact_form_contact_category_edit_form_alter(&$form, &$form_state) {
+    $form['actions']['translate'] = array(
+    '#type' => 'submit',
+    '#name'   => 'save_translate',
+    '#value' => t('Save and translate'),
+  );
+  $form['#submit'][] = 'i18n_contact_form_contact_category_edit_form_submit';
+}
+
+/**
+ * Remove strings for edited/added categories.
+ */
+function i18n_contact_form_contact_category_edit_form_submit($form, &$form_state) {
+  $contact = $form_state['values'];
+  i18n_string_object_update('contact_category', $contact);
+  // If the save and translate button was clicked, redirect to the translate
+  // tab instead of the block overview.
+  if ($form_state['triggering_element']['#name'] == 'save_translate') {
+    $form_state['redirect'] = 'admin/structure/contact/edit/' . $contact['cid'] . '/translate';
+  }
+}
+
+/**
+ * Implements hook_form_FORM_ID_alter().
+ */
+function i18n_contact_form_contact_site_form_alter(&$form, &$form_state) {
+  // Example of array translation. The placeholder '*' indicates the name part to be replace by the array keys
+  if (isset($form['cid']['#options'])) {
+    $form['cid']['#options'] = i18n_string_translate("contact:category:*:category", $form['cid']['#options'], array('sanitize' => FALSE));
+  }
+}
+
+/**
+ * Implements hook_mail_alter().
+ */
+function i18n_contact_mail_alter(&$message) {
+  if (in_array($message['id'], array('contact_page_mail', 'contact_page_copy', 'contact_page_autoreply'))) {
+    // Alter the first part of the subject of emails going out if they need
+    // translation.
+    $contact = i18n_string_object_translate('contact_category', $message['params']['category'], array('langcode' => $message['language']->language));
+    $message['subject'] = t(
+      '[!category] !subject',
+      array('!category' => $contact['category'], '!subject' => $message['params']['subject']),
+      array('langcode' => $message['language']->language)
+    );
+
+    if ($message['id'] == 'contact_page_autoreply') {
+      // Overwrite the whole message body. Maybe this is not entirely responsible
+      // (it might overwrite other existing items altered in by others),
+      // but unfortunately Drupal core cotact module does not make its item
+      // identifiable easily.
+      $message['body'] = array($contact['reply']);
+    }
+  }
+}