Failing to login with Facebook changes the site's language

[serge1peshcoff]

I have a Facebook account registered to another email address, and while trying to log in, sometimes it causes the site to change its language.

Steps to reproduce:

1. go to http://www.hitchlog.com/en/hitchhikers/login
2. click "Sign in with Facebook"
3. get a message Could not authenticate you from Facebook because "Invalid credentials".

If you would do it a few times, sometimes a site language is changed.