$OldList = Get-WinUserLanguageList
Set-WinUserLanguageList -Force -LanguageList (New-WinUserLanguageList -Language en-US)
Set-WinUserLanguageList -Force -LanguageList $OldList
$OldList = Get-WinUserLanguageList
Set-WinUserLanguageList -Force -LanguageList (New-WinUserLanguageList -Language en-US)
Set-WinUserLanguageList -Force -LanguageList $OldList