Translation text count of contributors to a group

Commons group module (commons_groups.module, lines 297-301) uses this code for a count of group conrtibutors text on commons all groups page (path like this: www.sitename.com/groups):

$contributors_count = $view->total_rows;
$output .= l(t('@contributors_count @contributors', array(
  '@contributors_count' => $contributors_count,
  '@contributors' => format_plural($contributors_count, 'contributor', 'contributors'),
)), 'node/' . $group->nid . '/contributors');

But it does not allow to translate a count of contributors text correctly (see this) - it does not need to use t() function, as i understood.

This changed code does work correctly:

$output .= l(format_plural($contributors_count, '1 contributor', '@count contributors'), 
'node/' . $group->nid . '/contributors');

Thanks.