There is a survey that is sent to multiple partners. Survey is designed in English. This survey will be sent to partners in German, French languages.

How to make Odoo send invitation to survey in a partner's language? Is that possible at all in Odoo? Say a partner has language: German. When a survey manager tries to send invitation link an e-mail template is not sent in the language of the partner.

It doesn't work if the e-mail template the field "Email Configuration"->"Language" contains ${object.partner_id.lang} or ${object.lang}.

What value has to be in the e-mail template's field "Email Configuration"->"Language" so that when sending invitation to the survey the e-mail would be sent in the language of the partner.

One more question: how to make proper URL of the survey based on the partner's language? There is __URL__ in the template that is replaced by the URL of the survey. The real link should be de_DE/__URL__ if the partner's that receives this e-mail language is German.