openstamanager/templates/preventivi/footer.php

<?php
/*
 * OpenSTAManager: il software gestionale open source per l'assistenza tecnica e la fatturazione
 * Copyright (C) DevCode s.r.l.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 */

if (!$is_last_page) {
    return;
}

echo '
<table>
    <tr>
        <td style="vertical-align:bottom;" width="50%">
            '.tr('lì').', ___________________________
        </td>

        <td align="center" style="vertical-align:bottom;" width="50%">
            '.tr('Firma per accettazione', [], ['upper' => true]).'<br><br>
            _____________________________________________
        </td>
    </tr>
</table>
<br>';