In the documentation of I18n there is one key missing: general_credentials_error
login_blank: can not be blank
login_not_found: is not valid
login_invalid: should use only letters, numbers, spaces, and .-_@ please.
consecutive_failed_logins_limit_exceeded: Consecutive failed logins limit exceeded, account is disabled.
email_invalid: should look like an email address.
password_blank: can not be blank
password_invalid: is not valid
not_active: Your account is not active
not_confirmed: Your account is not confirmed
not_approved: Your account is not approved
no_authentication_details: You did not provide any details for authentication.
user_session: UserSession (or whatever name you are using)
user_session: (or whatever name you are using)
remember_me: remember me
This was fixed in 09fe79b