Sonarr/UI/Series/Delete/DeleteSeriesTemplate.html

<div class="modal-header">
    <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
    <h3>Delete: {{title}}</h3>
</div>
<div class="modal-body">
    <p>Are you sure you want to delete '{{title}}'?</p>

    <div class="series-delete-files">
        <label class="checkbox">
            <input class="x-delete-files" type="checkbox" value="true">
            Delete all files from disk?
        </label>
    </div>
</div>
<div class="modal-footer">
    <button class="btn" data-dismiss="modal">cancel</button>
    <button class="btn btn-danger x-confirm-delete">delete</button>
</div>