"The file is not marked as executable" popup is not translated

While double-clicking on an ".exe" file in Nautilus, before Wine is launched there is a check on the status of its executable bit. If not set, a warning is shown in a popup, and you have to set the executable bit yourself.

The problem is that although my Ubuntu session is in French, this message is displayed in English:
"
The file '/home/mathieu/Téléchargements/InstallMyTomTomSA.exe' is not marked as executable. If this was downloaded or copied from an untrusted source, it may be dangerous to run. For more details, read about the executable bit.
"

The derivated problem -- wich should be fixed if the string is translated -- is that "executable bit" is an HTTP link to an English only page (https://wiki.ubuntu.com/Security/ExecutableBit).

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: mime-support 3.51-1ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: wl
ApportVersion: 1.23-0ubuntu3
Architecture: i386
Date: Wed Oct 19 22:25:33 2011
Dependencies:

EcryptfsInUse: Yes
ExecutablePath: /usr/bin/cautious-launcher
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
InterpreterPath: /bin/bash
PackageArchitecture: all
SourcePackage: mime-support
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (6 days ago)