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$wgTranslateCC['wiki-sidebar'] = 'addSidebarMessageGroup';
function addSidebarMessageGroup( $id ) {
  $mg = new WikiMessageGroup( $id, 'sidebar-messages' );
  $mg->setLabel( 'Sidebar' );
  $mg->setDescription( 'Messages used in the sidebar of this wiki' );
  return $mg;
}


According to https://www.mediawiki.org/wiki/Help:Extension:Translate/Unstructured_element_translation the preceding code should be added to config file. Please do so for Wikimania 2013, thanks.