flectra/addons/mail/views/mail_templates.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
    <data>
        <template id="assets_backend" name="mail assets" inherit_id="web.assets_backend">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/mail/static/src/js/many2many_tags_email.js"></script>

                <script type="text/javascript" src="/mail/static/src/js/client_action.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/client_action_mobile.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/chat_window.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/extended_chat_window.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/document_viewer.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/composer.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/chat_manager.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/chatter.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/chatter_composer.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/followers.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/form_renderer.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/basic_view.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/thread.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/thread_field.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/systray.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/tour.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/utils.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/window_manager.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/activity.js"></script>
                <script type="text/javascript" src="/mail/static/src/js/chat_mixin.js"></script>

                <link rel="stylesheet" href="/mail/static/src/less/announcement.less"/>
                <link rel="stylesheet" href="/mail/static/src/less/client_action.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/chat_window.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/extended_chat_window.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/composer.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/chatter.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/followers.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/thread.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/systray.less" type="text/less"/>
                <link rel="stylesheet" href="/mail/static/src/less/mail_activity.less"/>
            </xpath>
        </template>

        <template id="qunit_suite" name="mail_tests" inherit_id="web.qunit_suite">
            <xpath expr="//t[@t-set='head']" position="inside">
                <script type="text/javascript" src="/mail/static/tests/client_action_tests.js"></script>
                <script type="text/javascript" src="/mail/static/tests/chatter_tests.js"></script>
                <script type="text/javascript" src="/mail/static/tests/systray_tests.js"></script>
                <script type="text/javascript" src="/mail/static/tests/chat_window_test.js"></script>
            </xpath>
        </template>

        <template id="message_origin_link">
            <p>This <t t-esc="self._description.lower()"/> has been <span t-if="edit">modified</span><span t-if="not edit">created</span> from:
                <t t-foreach="origin" t-as="o">
                    <a href="#" t-att-data-oe-model="o._name" t-att-data-oe-id="o.id"> <t t-esc="o.display_name"/></a><span t-if="origin.ids[-1:] != o.ids">, </span>
                </t>
            </p>
        </template>

        <template id="message_user_assigned">
            <p>Dear <t t-esc="object.user_id.name"/>,</p>
            <p>You have been assigned to the <t t-esc="object._description.lower()"/> <t t-esc="object.name_get()[0][1]"/>.</p>
            <p>
                <a t-att-href="'/mail/view?model=%s&amp;res_id=%s' % (object._name, object.id)"
                        style="background-color: #9E588B; margin-top: 10px; padding: 10px; text-decoration: none; color: #fff; border-radius: 5px; font-size: 16px;">
                    View <t t-esc="object._description.lower()"/>
                </a>
            </p>
            <p style="color:#9E588B;">Powered by <a target="_blank" href="https://www.flectra.com">Flectra</a>.</p>
        </template>

        <template id="message_activity_done">
<div>
    <p>
        <strong><span t-attf-class="fa #{activity.activity_type_id.icon}"/></strong> <span t-field="activity.activity_type_id.name"/> done
        by <span t-field="activity.user_id.name"/>:
        <span t-if="activity.summary" t-field="activity.summary"/>
    </p>
    <div t-field="activity.note" style="margin-left: 8px;"/>
    <div t-if="activity.feedback" style="margin-top: 8px;">
        <strong> Feedback</strong>
    <div t-field="activity.feedback" style="margin-left: 8px;"></div>
    </div>
</div>
        </template>

    </data>
</flectra>