Authentication dialog header string ignores LC_MESSAGES

[Someone]

When you see an authentication dialog from some applications like the software-center or update-manager the authentication dialog header string ignores the LC_MESSAGES variables and displays the string using the current locale as set in language support (LANG environment variable if I'm not mistaken) even when you have the language for menus and windows set to a different language (LC_MESSAGES environment variable).

I'm also seeing this behavior with the string "Receiving" when installing packages from any program. It displays in the language set for my locale instead of the language set for menus and windows.

By authentication dialog I mean the one other then gksudo which I think comes from policykit.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: policykit-1-gnome 0.99-1ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic i686
Architecture: i386
Date: Fri Oct 14 00:22:39 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: policykit-1-gnome
UpgradeStatus: No upgrade log present (probably fresh install)

[Someone (temp4746)]

Confirmed also in 11.10
The string "Receiving" might be "Downloading"
I'm translating what's appearing in the dialog :P