mail.html.twig in Devel 8.3

{% block toolbar %}
    {% set icon %}
    <a href="{{ url("webprofiler.dashboard", {profile: token}, {fragment: "mail"}) }}" title="{{ 'Mail'|t }}">
        <img height="28" alt="{{ 'Mail'|t }}"
             src="data:image/png;base64,{{ collector.icon }}"/>
        <span class="sf-toolbar-status">{{ collector.mailsent }}</span>
    </a>
    {% endset %}
    {% set text %}
    <div class="sf-toolbar-info-piece">
        <b>Mail sent</b>
        <span>{{ collector.mailsent }}</span>
    </div>
    {% endset %}

    <div class="sf-toolbar-block">
        <div class="sf-toolbar-icon">{{ icon|default('') }}</div>
        <div class="sf-toolbar-info">{{ text|default('') }}</div>
    </div>
{% endblock %}

{% block panel %}
    <script id="mail" type="text/template">
        <h2 class="panel__title">{{ 'Mail dashboard'|t }}</h2>

        <% if( data.mail.length != 0){ %>
        <% _.each( data.mail, function( item ) { %>
        <div class="panel__container">
            <div class="panel__expand-header">
                <ul class="list--inline">
                    <li>
                        <b>{{ 'Plugin'|t }}</b>: <%= Drupal.webprofiler.helpers.classLink(item.method) %>
                    </li>
                    <li>
                        <b>{{ 'ID'|t }}</b>: <%- item.message.id %>
                    </li>
                    <li>
                        <b>{{ 'To'|t }}</b>: <%- item.message.to %>
                    </li>
                    <li>
                        <b>{{ 'Subject'|t }}</b>: <%- item.message.subject %>
                    </li>
                </ul>
                <div class="button--flat l-right js--panel-toggle">{{ 'Info'|t }}</div>
            </div>

            <div class="panel__expand-content">
                <table class="table--duo">
                <% _.each( item.message, function( message, key ) { %>
                <% if( key != 'params' && key != 'headers' ){ %>
                <tr>
                    <th><%- key %></th>
                    <td><%- message %></td>
                </tr>
                <% } %>
                <% }); %>
                </table>
                <table class="table--duo">
                    <% _.each( item.message.headers, function( header, key ) { %>
                    <tr>
                        <th><%- key %></th>
                        <td><%- header %></td>
                    </tr>
                    <% }); %>
                </table>
            </div>

        </div>
        <% }); %>
        <% } else { %>
        <div class="panel__container">
            <p>{{ 'No mail sent'|t }}</p>
        </div>
        <% } %>
    </script>
{% endblock %}