laravel/application/language/pl/pagination.php

<?php

return array(

    /*
    |--------------------------------------------------------------------------
    | Pagination Language Lines
    |--------------------------------------------------------------------------
    |
    | The following language lines are used by the paginator library to build
    | the pagination links. You're free to change them to anything you want.
    | If you come up with something more exciting, let us know.
    |
    */

    'previous' => '&laquo; Poprzednia',
    'next'     => 'Następna &raquo;',

);