/**
  * enter - class method
  * change to selected translation
  * @static
  * @param smdoc $foowd Reference to the foowd environment object. 
  */
 function class_enter(&$foowd)
 {
     $translation_id = new input_querystring('langid');
     $foowd->track('foowd_workspace->class_enter', $translation_id->value);
     $uri_arr = array();
     if ($translation_id->wasSet && $translation_id->wasValid && smdoc_translation::enterWorkspace($foowd, $translation_id->value)) {
         if ($translation_id->value == 0) {
             $_SESSION['ok'] = USER_DEFAULT_TRANSLATION;
         } else {
             $_SESSION['ok'] = USER_NEW_TRANSLATION;
         }
         $uri_arr['objectid'] = $translation_id->value;
         $uri_arr['classid'] = TRANSLATION_CLASS_ID;
     } else {
         $_SESSION['error'] = WORKSPACE_CHANGE_FAILED;
     }
     $foowd->track();
     //    $foowd->loc_forward( getURI($uri_arr, FALSE) );
     //    exit;
 }