Allow to override the title of action configuration form

It is usefull to be able to override action configuration form title as curreте one does not always soound good. You can adв following code

      $title_callback = $operation['callback'].'_title';
      if (function_exists($title_callback)) {
        $title = call_user_func(
          $title_callback, 
          array(
            'view' => $plugin->view, 
            'selection' => array_filter($form_state['storage'][VIEWS_BULK_OPS_STEP_VIEW]['objects']['selection']), 
            'settings' => $plugin->get_operation_settings($operation)));
        drupal_set_title($title);
      }
      else {
        drupal_set_title(t('Set parameters for \'%action\'', array('%action' => $operation['label'])));
      }

in function views_bulk_operations_form in VIEWS_BULK_OPS_STEP_CONFIG processing section. Developer will be able to define function to provide title or default one will be used.