data-protection/website_contact_extend/data/email_templates.xml

<?xml version="1.0" encoding="utf-8"?>

<odoo>

    <record id="verification_email_template" model="mail.template">
        <field name="name">Email verification link</field>
        <field name="subject">mail verification link</field>
        <field name="email_to">${(not object.partner_id and object.email_from)|safe}</field>
        <field name="model_id" ref="crm.model_crm_lead"/>
        <field name="auto_delete" eval="True"/>
        <field name="body_html"><![CDATA[
            <p>
            % if object.partner_id
            Dear <strong>${object.partner_id.name}</strong>,<br/>
            % endif
            % if not object.partner_id
            Dear <strong>${object.email_from}</strong>,<br/>
            % endif

            Please click on below link to verify your email address <strong>${object.email_link}</strong>.<br/>

            Thank you.
            </p>
        ]]>
        </field>
    </record>

    <record id="confirmation_email_template" model="mail.template">
        <field name="name">Email confirmation</field>
        <field name="subject">Verified Email</field>
        <field name="email_to">${user.email|safe}</field>
        <field name="model_id" ref="base.model_res_partner"/>
        <field name="auto_delete" eval="True"/>
        <field name="body_html"><![CDATA[
            <p>
            Dear <strong>${user.partner_id.name}</strong>,<br/>

            This email address <strong> ${object.email}</strong> has been verified by user.<br/>

            Thank you.
            </p>
        ]]>
        </field>
    </record>

</odoo>