materio-base-d7/sites/all/modules/contrib/localisation/entity_translation_tabs/entity_translation_tabs.module

<?php
/**
 * @file entity_translation_tabs.module
 * This module gives you a tab for each language on entity translation nodes.
 */

/**
 * Implements hook_menu_alter().
 */
function entity_translation_tabs_menu_alter(&$items) {
  $items['node/%node/edit']['weight'] = 3;
  $items['node/%node/edit']['title'] = t('Source');
  // It would be nice to hide the translate tab when it is no longer needed
  // but this causes problems with the entity_translation module.
}

/**
 * Implements hook_menu().
 */
function entity_translation_tabs_menu() {

  $languages = language_list('enabled');

  // Eventually it would be nice to replace this series of menu entries with
  // the same code as the entity_translation module's hook_menu code to allow
  // us to show the tabs in taxonomy, user, and other types of entities.
  foreach ($languages[1] as $key => $value) {
    $items['node/%node/' . "$key"] = array(
      'title' => 'Edit' . ' [' . $value->name . ']',
      'page callback' => 'entity_translation_tabs_switcher',
      'page arguments' => array(1, 2),
      'access callback' => 'node_access',
      'access arguments' => array('update', 1),
      'weight' => 0,
      'type' => MENU_LOCAL_TASK,
      'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
    );
  }
  return $items;
}

/**
 * Redirection logic to determine where the tabs will take you.
 */
function entity_translation_tabs_switcher($node, $lang) {

  // This switcher currently does a drupal_goto for each appropriate case, but
  // the intended functionality is to load the entity translation form directly
  // on each applicable tab. It will require loading the appropraite inc files
  // and then to load the entity_translation_edit_form with all the parameters.
  $nid = $node->nid;
  $und = FALSE;
  $result = db_query(
    "SELECT language, source FROM {entity_translation} WHERE entity_id=:eid",
    array(
      ':eid' => $nid,
    ));
  foreach ($result as $record) {
    // Source is not set, therefore it is source.
    if (sizeof($record->source) == 1) {
      $source = $record->language;
    }
    // Source is undefined, therefore edit original.
    if ($record->language == 'und') {
      $und = TRUE;
    }
    // Translation exists, let's go there.
    if ($record->language == $lang) {
      drupal_goto('node/' . $nid . '/edit/' . $lang);
    }
  }
  if ($und != TRUE) {
    drupal_set_message(t('This is a new translation, please translate it now.'), 'warning');
    drupal_goto('node/' . $nid . '/edit/add/' . $source . "/" . $lang);
  }
  else {
    drupal_set_message(t('This content is set to display on all languages.
      Set the language of this page to make it translatable.'), 'warning');
    drupal_goto('node/' . $nid . '/edit');
  }
  return;
}