Error message for not existing user not user friendly

[klatka]

A user tries to login with his social account but there is no associated user and auto-create users is disabled which results in an error message.

The error message should be user-orientated and something like: "You don't have an account. Please contact your administrator." rather than informing that some admin options being disabled.

[zorn-v]

You can change it at https://www.transifex.com