icingaweb2/application/views/scripts/config/authentication/modify.phtml

<h4>
    <i class="icinga-icon-edit"></i>
    Edit Backend "<?= $this->escape($this->name); ?>"
</h4>

<?php if (isset($this->messageBox)): ?>
  <?= $this->messageBox->render() ?>
<?php endif ?>

<?php if ($this->form->getErrorMessages()): ?>
<div class="alert alert-danger">
  <?php foreach ($this->form->getErrorMessages() as $error): ?>
    <?= $this->escape($error); ?><br/>
  <?php endforeach; ?>
</div>
<?php endif; ?>

<?= $this->form ?>