easyappointments/application/views/layouts/backend/backend_footer.php

<?php
/**
 * @var string $user_display_name
 */
?>
<div id="footer" class="d-md-flex justify-content-md-between">
    <div id="footer-content">
        <img class="me-1" src="<?= base_url('assets/img/logo-16x16.png') ?>" alt="Easy!Appointments Logo">
        <a href="https://easyappointments.org">
            Easy!Appointments
        </a>

        v<?= config('version') ?>
        <?php if (config('release_label')): ?>
            - <?= config('release_label') ?>
        <?php endif ?>

        |

        <img class="mx-1" src="<?= base_url('assets/img/alextselegidis-logo-16x16.png') ?>" alt="Alex Tselegidis Logo">
        <a href="https://alextselegidis.com">
            Alex Tselegidis
        </a>
        &copy; <?= date('Y') ?> - Software Development

        |

        <?= lang('licensed_under') ?>
        <a href="https://www.gnu.org/licenses/gpl-3.0.en.html">
            GPL-3.0
        </a>

        |

        <span id="select-language" class="badge bg-secondary">
            <i class="fas fa-language me-2"></i>
        	<?= ucfirst(config('language')) ?>
        </span>

        |

        <a href="<?= site_url('appointments') ?>">
            <?= lang('go_to_booking_page') ?>
        </a>
    </div>

    <div id="footer-user-display-name">
        <?= lang('hello') . ', ' . $user_display_name ?>!
    </div>
</div>