knowledge/document_page_approval/data/email_template.xml

<?xml version="1.0" encoding="UTF-8" ?>
<odoo>
    <!-- If user wants to make upgrade-proof customizations to email templates, he should edit ir.model.data and check noupdate himself -->
    <record id="email_template_new_draft_need_approval" model="mail.template">
        <field name="name">Automated new draft need approval Notification Mail</field>
        <field
            name="email_from"
        >{{object.create_uid.company_id.email or 'noreply@localhost.com'}}</field>
        <field
            name="subject"
        >New version of {{object.display_name}} needs your approval</field>
        <field name="model_id" ref="model_document_page_history" />
        <field name="auto_delete" eval="True" />
        <field name="lang">{{object.create_uid.partner_id.lang}}</field>
        <field name="body_html" type="html">
            <p>Hello,</p>
            <p><t t-out="object.create_uid.name" /> submited a new Change Request for <b
                t-out="object.page_id.name"
            /> and it needs your approval.</p>
            <h1>
                <a t-att-href="object.page_url" t-out="object.display_name" />
            </h1>
            <p>
                <b>Modified by:</b>
                <t t-out="object.create_uid.name" />
            </p>
            <p>
                <b>Date:</b>
                <t t-out="object.create_date" />
            </p>
            <t t-if="object.summary">
                <h3>Summary</h3>
                <p t-out="object.summary" />
            </t>
            <h3>Diff</h3>
            <div style="overflow-x:scroll; font-size:0.85em; margin-bottom:2em;">
                <t t-out="object.diff" />
            </div>
            <p>Have a great day.</p>
            <br />
            <p>Odoo</p>
        </field>
    </record>
</odoo>