Update forgot_password method to make sure a user was returned before
proceeding. If an email is entered that's not in the database it will
return to the forgot password page and display an error.
Updated forgotten_password method to only return user info if the
user is active.
Updated auth controller to use error message from language files instead
of being hardcoded.
Updated language files to add new Forgot Password error message for
when someone tries to reset password for an email address that isn't in
the database.
Merge pull request #480 from thomasruns/2

Update 2 issues with forgot password process