6.x plural form for "!Points"

Corrected issue title.

We used thid code in our project

function userpoints_plural_stub_userpoints($op,  $params = array()) {
  switch ($op) {
    case 'points after':
      // number
      $count = $params['points'];
      if ($count!==0) {
        // now have
        $sum = userpoints_get_current_points($params['uid'], $params['tid']);

        // placeholders
        global $user;
        $user_pointed = user_load($params['uid']);
        $subst = array(
          '@count' => format_plural(abs($count), '@count userpoint', '@count userpoints'),
          '@sum' => format_plural($sum, '@count userpoint', '@count userpoints'),
          '@user' => $user_pointed->name,
        );
        // @@@ TODO: add userpoints category to the output.
        $subst = array_merge(userpoints_translation(),$subst);
        // formst output
        if ($user->uid == $params['uid']) { // own points
          if ($count > 0) {
            drupal_set_message(
              t('You gained @count and now you have @sum.', $subst)
            );
          }else{
            drupal_set_message(
              t('You lost @count and now you have @sum.', $subst)
            );
          }
        } else { // other user's points
          if ($count > 0) {
            drupal_set_message(
              t('User @user gained @count and have @sum now.', $subst)
            );
          }else{
            drupal_set_message(
              t( 'User @user lost @count and have @sum now.', $subst)
            );
          }
        }
        
      }

      break;
    case 'setting':
      // plurals
      $group = 'plural_messages';
      $form[$group] = array(
        '#type'        => 'fieldset',
        '#collapsible' => TRUE,
        '#collapsed'   => TRUE,
        '#title'       => t('Fixed plural messages'),
        //'#description' => t('How much !points...', userpoints_translation()),
      );
      $form[$group][URS_VARIABLE_PLURAL] = array(
        '#type'        => 'checkbox',
        '#title'       => t('Enable plural messages'),
        '#return_value'  => 1,
        '#default_value' => variable_get(URS_VARIABLE_PLURAL, 0),
        '#description' => t('Show true plural messages when !points are gained or lost', userpoints_translation()),
      );
      return $form;
      break;
  }

}