apps-store/website_form_recaptcha/views/assets.xml

<!--
    Copyright 2016-2017 LasLabs Inc.
    License AGPL-3 or later (http://www.gnu.org/licenses/agpl.html).
-->
<odoo>
    <template
        id="assets_frontend"
        name="website_form_recaptcha Assets"
        inherit_id="website.assets_frontend"
    >
        <xpath expr="." position="inside">
            <script src="/website_form_recaptcha/static/src/js/field_recaptcha.js" />
        </xpath>
    </template>
</odoo>