zulip/static/templates/stream_settings/stream_privacy_setting_modal.hbs

<div id="stream_privacy_modal" class="modal modal-bg hide fade new-style" tabindex="-1" role="dialog" aria-labelledby="stream_privacy_modal_label" aria-hidden="true">
    <div class="modal-header">
        <button type="button" class="close close-modal-btn" data-dismiss="modal" aria-label="{{t 'Close' }}"><span aria-hidden="true">&times;</span></button>
        <h3 id="stream_privacy_modal_label">{{#tr}}Change stream permissions for #{stream_name}{{/tr}}<span class="email"></span></h3>
    </div>
    <div class="modal-body">
        {{> ../stream_types }}
    </div>
    <div class="modal-footer">
        <button class="button rounded close-modal-btn" data-dismiss="modal">{{t "Cancel" }}</button>
        <button class="button rounded btn-danger" id="change-stream-privacy-button"
          tabindex="-1" data-stream-id="{{stream_id}}">
            {{t "Save changes"}}
        </button>
    </div>
</div>