Re-creating Multilanguage Links: A Step-by-Step Guide

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$TenantName = 'yourtenantname'
$SiteName = 'YourSiteName'

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Connect-PnPOnline -Url "https://$($TenantName).sharepoint.com/sites/$SiteName" -interactive

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$LanguageFolders = Get-PnPFolderInFolder -Identity 'SitePages' | Where-Object { $_.Name -match '^[a-z]{2}$' }

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foreach ($LanguageFolder in $LanguageFolders) {
    $Pages = Get-PnPListItem -List 'SitePages' -FolderServerRelativeUrl "/sites/$SiteName/SitePages/$($LanguageFolder.Name)"

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    foreach ($Page in $Pages) {
        # Retrieve the default page in the root directory
        $DefaultPage = Get-PnPListItem -List 'SitePages' -Query "<View><Query><Where><Eq><FieldRef Name='FileLeafRef'/><Value Type='Text'>$($Page.FieldValues.FileLeafRef)</Value></Eq></Where></Query></View>"

        # Check if the default page exists and if the translation language is already linked
        if ($DefaultPage) {
            if ($DefaultPage.FieldValues._SPTranslatedLanguages -cnotcontains $Page.FieldValues._SPTranslationLanguage) {
                $OldLanguages = $DefaultPage.FieldValues._SPTranslatedLanguages
                $NewLanguages = $OldLanguages + $Page.FieldValues._SPTranslationLanguage
                Set-PnPListItem -List 'SitePages' -Identity $DefaultPage.Id -Values @{'_SPTranslatedLanguages' = $NewLanguages } -UpdateType SystemUpdate
            }
        }
    }
}

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$TenantName = 'yourtenantname'
$SiteName = 'YourSiteName'

Connect-PnPOnline -Url "https://$($TenantName).sharepoint.com/sites/$SiteName" -interactive

$LanguageFolders = Get-PnPFolderInFolder -Identity 'SitePages' | Where-Object { $_.Name -match '^[a-z]{2}$' }

foreach ($LanguageFolder in $LanguageFolders) {
    $Pages = Get-PnPListItem -List 'SitePages' -FolderServerRelativeUrl "/sites/$SiteName/SitePages/$($LanguageFolder.Name)"

    foreach ($Page in $Pages) {
        # Retrieve the default page in the root directory
        $DefaultPage = Get-PnPListItem -List 'SitePages' -Query "<View><Query><Where><Eq><FieldRef Name='FileLeafRef'/><Value Type='Text'>$($Page.FieldValues.FileLeafRef)</Value></Eq></Where></Query></View>"

        # Check if the default page exists and if the translation language is already linked
        if ($DefaultPage) {
            if ($DefaultPage.FieldValues._SPTranslatedLanguages -cnotcontains $Page.FieldValues._SPTranslationLanguage) {
                $OldLanguages = $DefaultPage.FieldValues._SPTranslatedLanguages
                $NewLanguages = $OldLanguages + $Page.FieldValues._SPTranslationLanguage
                Set-PnPListItem -List 'SitePages' -Identity $DefaultPage.Id -Values @{'_SPTranslatedLanguages' = $NewLanguages } -UpdateType SystemUpdate
            }
        }
    }
}

Disconnect-PnPOnline