stock_availability_template.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <!--  Inherit parent  -->
    <template id="stock_available_display_3a" inherit_id="website_sale_stock_available_display.stock_info" name="3A Cart stock infos">
        <xpath expr="//div" position="replace">
            <t t-if="virtual_available > 0">
                <div t-attf-class="availability_messages text-#{virtual_available and 'success' or 'danger'}">
                    <span><t t-esc="virtual_available"/> <t t-esc="line.product_uom.name"/> in stock</span>
                </div>
            </t>
            <t t-else="">
                <div class="text-success">
                     Disponible fournisseur
                </div>
            </t>
        </xpath>
    </template>
</odoo>