odoo/addons/im/static/src/xml/im_common.xml

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

<templates>
<t t-name="conversation">
    <div class="oe_im_chatview_header">
        <img t-att-src="to_url('im/static/src/img/green.png')" class="oe_im_chatview_online"/>
        <t t-esc="widget.user.get('name') || _t('You')"/>
        <button class="oe_im_chatview_close">×</button>
    </div>
    <div class="oe_im_chatview_disconnected">
        <t t-esc='widget.user.get("name") + _t(" is offline. He/She will receive your messages on his/her next connection.")'/>
    </div>
    <div class="oe_im_chatview_content">
        <div></div>
    </div>
    <div class="oe_im_chatview_footer">
        <input class="oe_im_chatview_input" t-att-placeholder="widget.inputPlaceholder" />
    </div>
</t>

<t t-name="conversation_bubble">
    <div class="oe_im_chatview_bubble">
        <div class="oe_im_chatview_clip">
            <img class="oe_im_chatview_avatar" t-att-src="user.get('image_url')"/>
        </div>
        <div class="oe_im_chatview_from"><t t-esc="user.get('name') || _t('You')"/></div>
        <div class="oe_im_chatview_bubble_list">
            <t t-foreach="items" t-as="item">
                <div class="oe_im_chatview_bubble_item"><t t-esc="item"/></div>
            </t>
        </div>
        <div class="oe_im_chatview_time"><t t-esc="time"/></div>
    </div>
</t>
</templates>