upstream-zulip/web/templates/settings/convert_demo_organization_form.hbs

<div id="convert-demo-organization-form">
    {{#unless user_has_email_set}}
    <div class="demo-organization-add-email-banner banner-wrapper"></div>
    {{/unless}}
    <p>{{t "Everyone will need to log in again at the new URL for your organization." }}</p>
    <form class="subdomain-setting modal-form">
        <div class="input-group">
            <label for="string_id" class="inline-block modal-field-label">{{t "Organization URL" }}</label>
            <div id="subdomain_input_container">
                <input id="new_subdomain" type="text" class="modal_text_input" autocomplete="off" name="string_id" placeholder="{{t 'acme' }}"/>
                <label for="string_id" class="domain_label">.{{ realm_domain }}</label>
            </div>
        </div>
    </form>
</div>