Check GPO files on SYSVOL for every .adm/.admx file ha a correspondant resource .adml file in language sub dir.

Check-GPOResources.ps1

# check GPO files on SYSVOL for every .adm and .admx file has a correspondant resource .adml file in language sub dir.
# https://learn.microsoft.com/en-us/troubleshoot/windows-server/group-policy/create-central-store-domain-controller
# 

$p='\\ad.contoso.local\sysvol\ad.contoso.local\Policies\PolicyDefinitions'
$langdirs= Get-ChildItem -Path $p -Directory -Filter '*-*'

Set-Location -Path $p

$adm = Get-ChildItem -Path $p -File 

foreach ($a in $adm) {
    foreach ($l in $langdirs) {
        $tpath=Join-Path -Path $p -ChildPath $l | Join-Path -ChildPath "$((Get-Item $a).Basename).adml"
        if (!(Test-Path $tpath )) {
            Write-Host $tpath
        }
    }
}