app/Template/project_role/remove.php

<div class="page-header">
    <h2><?= t('Remove a custom role') ?></h2>
</div>

<div class="confirm">
    <p class="alert alert-info">
        <?= t('Do you really want to remove this custom role: "%s"? All people assigned to this role will become project member.', $role['role']) ?>
    </p>

    <?= $this->modal->confirmButtons(
        'ProjectRoleController',
        'remove',
        array('project_id' => $project['id'], 'role_id' => $role['role_id'])
    ) ?>
</div>