game/modules_data/steps/first_step.php

<?php

use DarksLight2\Training\TrainingManager;

$short_name = 'first_step';

$manager = TrainingManager::getInstance();
$step = $manager->$short_name;
$button_text = 'Продолжить';
if(!$manager) {
    $button_text = '';
}
?>

<script>
    const training_data = () => {
        return {
            content: `<?=$step->message?>`,
            title: `<?=$step->title?>`,
            button_text: `<?=$button_text?>`
        }
    }
</script>
<script src="/js/training/modal.js"></script>

<script>
    modal.show()
</script>