firefly-iii/resources/lang/es_ES/pagination.php

<?php
declare(strict_types=1);

/**
 * pagination.php
 * Copyright (C) 2016 thegrumpydictator@gmail.com
 *
 * This software may be modified and distributed under the terms of the
 * Creative Commons Attribution-ShareAlike 4.0 International License.
 *
 * See the LICENSE file for details.
 */

return [

    'previous' => '&laquo; Anterior',
    'next'     => 'Siguiente &raquo;',

];