I have implemented a custom template in a custom document module which replaces the standard sale order document.
<!--Email template -->
<record id="sale.email_template_edi_sale" model="mail.template">
<field name="report_template" ref="report_custom_sale_order"/>
</record>
This works fine but now email template is NOT translated into user/partner language (Spanish in this case). Any tip on why this is happening and how to fix it?