odoo ignored customer lang after Inherit Quotation template  

<template id="report_saleorder_document_1" inherit_id="sale.report_saleorder_document">
           <t t-call="web.external_layout" position="replace">

           <t t-call="web.external_layout">
        <t t-set="doc" t-value="doc.with_context(lang=doc.partner_id.lang)" />
        <!-- t t-set="address">
</t>
</template >

<template id="report_saleorder_1">
    <t t-call="web.html_container">
        <t t-foreach="docs" t-as="doc">
            <t t-call="business_report. report_saleorder_document_1" t-lang="doc.partner_id.lang"/>
        </t>
    </t>
</template>

<template id="report_saleorder_pro_forma_1">
    <t t-call="web.html_container">
        <t t-set="is_pro_forma" t-value="True"/>
        <t t-foreach="docs" t-as="doc">
            <t t-call="business_report.report_saleorder_document_1" t-lang="doc.partner_id.lang"/>
        </t>
    </t>
</template>