For example we have a multi language odoo 13 with the default language German.

The url path in the frontend looks like

https://subdomain.domain.tld/shop/...

for the default language and e.g.

https://subdomain.domain.tld/fr/shop/...

for any other language.

Is it possible to set a language  url_code in the path for the default language e.g.

https://subdomain.domain.tld/de/shop/...