web/web_hide_db_manager_link/views/webclient_templates.xml

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

<openerp>
    <data>

        <template id="login_layout_no_db" inherit_id="web.login_layout" name="Login Layout">
            <xpath expr="//div[@class='oe_single_form_footer']" position="before">
                <t t-set="disable_database_manager" t-value="1"/>
            </xpath>
        </template>

    </data>
</openerp>