add language button

this code is default module code website_report module

<xpath expr="//footer" position="replace">       

<ul class="list-inline js_language_selector mt16" t-if="(request and request.website_multilang and len(languages) &gt; 1) or (website and editable)">           

<li t-foreach="languages" t-as="lg">               

<a t-att-href="url_for(request.httprequest.path + '?' + keep_query(), lang=lg[0])"                   t-att-data-lang="lg[0]"                  

t-att-data-default-lang="editable and 'true' if website and lg[0] == website.default_lang_code else None">                    <t t-esc="lg[1].split('/').pop()"/>                </a>            </li>            <li groups="base.group_website_publisher">                <t t-set="url_return" t-value="url_for('', '[lang]') + '?' + keep_query()"/>                <a t-attf-href="/web#action=base.action_view_base_language_install&amp;website_id=#{website.id if website else ''}&amp;url_return=#{url_return}">                    <i class="fa fa-plus-circle"/>                    Add a language...
                </a>           

</li>       

</ul>   

</xpath>