This document contains important information about known issues in Windows Embedded Standard 7 Service Pack 1.
Some dialog boxes may contain unlocalized text even with language packs installed
Some resources and dialog boxes can appear with English text even when language packs for Hebrew, Arabic Saudi, Bulgarian, Russian, Thai and Ukranian are installed. Primarily, the unlocalized text occurs in the Control Panel and Disk Cleanup dialog. To avoid this problem, you should include the languages in your initial build of the OS image, rather than add them to your image later.
Sysprep may fail after applying language packs to an image
Sysprep may fail if you add a language pack to your image after it is built. To avoid this problem, change the registry entry value HKLM\System\CurrnetControlSet\Services\tsusbhub:DisplayName from "@SYSTEMROOT%\system32\drivers\tsusbhub.sys, -1" to "Remote Desktop USB Hub" prior to running Sysprep.