birthday_calendar/template.xml

<openerp>
    <data>
        <template id="birthday_calendar.eiru_assets" name="birthday_calendar_eiru_assets" inherit_id="eiru_assets.assets">
            <xpath expr="." position="inside">
                <script type="text/javascript" src="/birthday_calendar/static/src/js/birthday_calendar.js"/>
            </xpath>
        </template>
    </data>
</openerp>