the language of google search plugin

Binary package hint: firefox

After the last update (to firefox 5.0) the google search plugin send me to the English page (google.com), but the language of my system is Russian. The older firefox (before update) send me to correct Russian page (google.ru).

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: firefox 5.0~b5+build1+nobinonly-0ubuntu0.11.04.1
ProcVersionSignature: Ubuntu 2.6.38-10.44-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: 27d085d9759b4ddd76e12b1330fe77bf
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Sat Jun 11 00:48:05 2011
FirefoxPackages:
 firefox 5.0~b5+build1+nobinonly-0ubuntu0.11.04.1
 flashplugin-installer 10.3.181.22ubuntu0.11.04.1
 adobe-flashplugin N/A
 icedtea-plugin N/A
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
ProcEnviron:
 LANGUAGE=ru_RU:en
 PATH=(custom, user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: firefox
UpgradeStatus: Upgraded to natty on 2011-04-16 (55 days ago)