Private Area redirect after login in multilanguage sites

Hello there.

I'm trying to configure a new private area to access to the form for add posts to blog. I have configured my site with multilanguage support and the pages add automatically /es or /en after the page name.

With login plugin, when I've logged the page showed is www.mysite.es/es/es/formpage instead www.mysite.es/es/formpage. I've added in formpage.md:

redirect_after_login: true
login_redirect_here: false
route_after_login: 'formpage'

Also I've tried:

redirect_after_login: true
login_redirect_here: false
route_after_login: '{{home_url}}/formpage'

I have not been able to correctly access the page with this configuration.

Can someone help me with this issue.
Thanks.