Login page doesn't translate

[Ampersand]

Thanks for explanation, just wondered how to gain any control over first-time-login messages.

1. Do you recommend above deleting en_US from production file set? Any drawbacks al or systemhealth risks?
2. Is it possible to have login page display in desired language (from the ones present in "lang" folder)? Ex with serving a variable in URL - site.com/admin/index.php?lang=pl_PL or any other?
3.Since 3.0 is capable of multiuser login does it make sense to define login language independent of users' settings?