en_US in URLs should not exist

• Type: Bug
• Status: Closed
• Resolution: Won't Fix
• Affects Version/s: 6.1.1 CE GA2
• Fix Version/s: 6.1.1 CE GA2
• Component/s: Content Display Widgets > Language widget
• Labels: None
• Environment: SUSE Linux Enterprise Server 11. Firefox 18.

I have removed support for en_US (and all other languages except for se_SV) in portal-ext.properties:
locales=sv_SE

When I in the browser add /en_US (or anything else - for example /ru_RU) at the end of my site's start page URL, I expect to get "404 - not found" or something similar. But instead I see the start page (in Swedish).