diff --git a/.gitignore b/.gitignore
index c534fa2..db513d5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 build/
 build-stage*
 .tools/
+.cache/
 *.pak
 *.tmp
 *.temp
diff --git a/ACTIONS.md b/ACTIONS.md
index e4ac5d4..22fb15a 100644
--- a/ACTIONS.md
+++ b/ACTIONS.md
@@ -28,6 +28,45 @@ REPORT_FORMAT:
   - remaining
 
 ACTIONS:
+  translation:diff:
+    intent: fetch_upstream_english_and_compare_with_ru
+    inputs:
+      - AGENTS.md::Canonical Paths::Upstream English reference
+      - Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml
+    plan:
+      - download_upstream_english_into_ignored_cache
+      - compare_en_vs_ru_by_contentuid_and_version
+      - classify_diff_into_missing_changed_stale
+      - write_machine_readable_and_markdown_reports_for_local_review
+    checks:
+      - xml_valid
+      - cache_path_gitignored
+      - local_only_no_ci_workflow_required
+    outputs:
+      - .cache/upstream/english.xml
+      - build/translation-diff/summary.json
+      - build/translation-diff/summary.md
+      - build/translation-diff/candidates.json
+  translation:apply:
+    intent: apply_translation_edits_to_russian_xml
+    inputs:
+      - Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml
+      - build/translation-diff/candidates.json
+      - external_edit_file_with_updates
+    plan:
+      - create_temporary_copy_of_russian_xml
+      - load_edit_file_and_temporary_xml
+      - apply_updates_and_optional_new_entries_by_contentuid
+      - write_utf8_bom_xml_to_temporary_copy
+      - validate_temporary_xml_via_separate_script
+      - replace_original_russian_xml_after_successful_validation
+      - report_changed_entries
+    checks:
+      - xml_valid
+      - contentuid_uniqueness_preserved
+      - only_requested_entries_changed
+    outputs:
+      - Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml
   translation:update:
     intent: sync_ru_translation_with_upstream
     inputs:
@@ -35,16 +74,18 @@ ACTIONS:
       - glossary/glossary.normalized.json
       - AGENTS.md::Canonical Paths::Upstream English reference
     plan:
-      - compare_en_vs_ru_by_keys
-      - classify_diff_into_new_changed_stale_candidate
-      - update_ru_for_new_and_changed_using_glossary
-      - validate_xml_structure_and_service_attributes
-      - prepare_delta_summary_counts
+      - refresh_upstream_english_cache
+      - compare_en_vs_ru_by_contentuid_and_version
+      - if_no_diff_report_translation_is_up_to_date_and_stop
+      - else_apply_prepared_edits_to_temporary_russian_copy
+      - validate_temporary_xml_via_separate_script
+      - replace_original_russian_xml_after_successful_validation
     checks:
       - xml_valid
       - glossary_consistency
       - scope_limited_to_localization_and_allowed_metadata
     outputs:
+      - message: translation_up_to_date
       - Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml
       - optional: Mods/DnD 5.5e AIO Russian/meta.lsx (release-only)
     after_success:
diff --git a/scripts/apply-translation-edits.ps1 b/scripts/apply-translation-edits.ps1
new file mode 100644
index 0000000..9344c27
--- /dev/null
+++ b/scripts/apply-translation-edits.ps1
@@ -0,0 +1,186 @@
+param(
+    [string]$RussianPath = "Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml",
+    [Parameter(Mandatory = $true)]
+    [string]$EditsPath
+)
+
+$ErrorActionPreference = "Stop"
+
+function Read-XmlDocument {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Path
+    )
+
+    $resolvedPath = [System.IO.Path]::GetFullPath($Path)
+    if (-not (Test-Path -LiteralPath $resolvedPath)) {
+        throw "XML file was not found: '$resolvedPath'."
+    }
+
+    [xml]$xml = Get-Content -LiteralPath $resolvedPath -Raw
+    if ($null -eq $xml.SelectSingleNode('/contentList')) {
+        throw "XML file does not contain '/contentList': '$resolvedPath'."
+    }
+
+    return @{
+        Path = $resolvedPath
+        Xml = $xml
+    }
+}
+
+function Get-ContentNodeMap {
+    param(
+        [Parameter(Mandatory = $true)]
+        [xml]$Xml
+    )
+
+    $map = @{}
+    foreach ($node in $Xml.SelectNodes('/contentList/content')) {
+        $contentUid = [string]$node.GetAttribute("contentuid")
+        if ([string]::IsNullOrWhiteSpace($contentUid)) {
+            continue
+        }
+
+        if ($map.ContainsKey($contentUid)) {
+            throw "Duplicate contentuid found in target XML: '$contentUid'."
+        }
+
+        $map[$contentUid] = $node
+    }
+
+    return $map
+}
+
+$russianDocument = Read-XmlDocument -Path $RussianPath
+$temporaryRussianPath = "$($russianDocument.Path).tmp"
+$validateScriptPath = Join-Path $PSScriptRoot "validate-translation-xml.ps1"
+
+if (-not (Test-Path -LiteralPath $validateScriptPath)) {
+    throw "Validation script was not found: '$validateScriptPath'."
+}
+
+if (Test-Path -LiteralPath $temporaryRussianPath) {
+    Remove-Item -LiteralPath $temporaryRussianPath -Force
+}
+
+Copy-Item -LiteralPath $russianDocument.Path -Destination $temporaryRussianPath -Force
+$russianDocument = Read-XmlDocument -Path $temporaryRussianPath
+$resolvedEditsPath = [System.IO.Path]::GetFullPath($EditsPath)
+if (-not (Test-Path -LiteralPath $resolvedEditsPath)) {
+    throw "Edits file was not found: '$resolvedEditsPath'."
+}
+
+$edits = Get-Content -LiteralPath $resolvedEditsPath -Raw | ConvertFrom-Json -Depth 10
+if ($null -eq $edits) {
+    throw "Edits file is empty or invalid JSON: '$resolvedEditsPath'."
+}
+
+$contentListNode = $russianDocument.Xml.SelectSingleNode('/contentList')
+if ($null -eq $contentListNode) {
+    throw "Target russian.xml does not contain '/contentList': '$($russianDocument.Path)'."
+}
+
+$nodeMap = Get-ContentNodeMap -Xml $russianDocument.Xml
+$updatedEntries = New-Object System.Collections.Generic.List[string]
+$addedEntries = New-Object System.Collections.Generic.List[string]
+
+$updates = @()
+if ($edits.PSObject.Properties.Name -contains "updates" -and $null -ne $edits.updates) {
+    $updates = @($edits.updates)
+}
+
+foreach ($edit in $updates) {
+    $contentUid = [string]$edit.contentuid
+    if ([string]::IsNullOrWhiteSpace($contentUid)) {
+        throw "Each update entry must contain non-empty 'contentuid'."
+    }
+
+    if (-not $nodeMap.ContainsKey($contentUid)) {
+        throw "Target russian.xml does not contain contentuid '$contentUid' for update."
+    }
+
+    $node = $nodeMap[$contentUid]
+    if ($edit.PSObject.Properties.Name -contains "version" -and -not [string]::IsNullOrWhiteSpace([string]$edit.version)) {
+        $node.SetAttribute("version", [string]$edit.version)
+    }
+
+    if ($edit.PSObject.Properties.Name -contains "text") {
+        $node.InnerText = [string]$edit.text
+    }
+
+    $updatedEntries.Add($contentUid) | Out-Null
+}
+
+$adds = @()
+if ($edits.PSObject.Properties.Name -contains "adds" -and $null -ne $edits.adds) {
+    $adds = @($edits.adds)
+}
+
+if (($updates.Count -eq 0) -and ($adds.Count -eq 0)) {
+    if (Test-Path -LiteralPath $temporaryRussianPath) {
+        Remove-Item -LiteralPath $temporaryRussianPath -Force
+    }
+    Write-Host "[apply-translation-edits.ps1] No edits requested. Original russian.xml left unchanged."
+    return
+}
+
+foreach ($edit in $adds) {
+    $contentUid = [string]$edit.contentuid
+    $version = [string]$edit.version
+    $text = [string]$edit.text
+
+    if ([string]::IsNullOrWhiteSpace($contentUid)) {
+        throw "Each add entry must contain non-empty 'contentuid'."
+    }
+
+    if ($nodeMap.ContainsKey($contentUid)) {
+        throw "Target russian.xml already contains contentuid '$contentUid'; use 'updates' instead of 'adds'."
+    }
+
+    if ([string]::IsNullOrWhiteSpace($version)) {
+        throw "Add entry '$contentUid' must contain non-empty 'version'."
+    }
+
+    if ([string]::IsNullOrWhiteSpace($text)) {
+        throw "Add entry '$contentUid' must contain non-empty 'text'."
+    }
+
+    $newNode = $russianDocument.Xml.CreateElement("content")
+    $newNode.SetAttribute("contentuid", $contentUid)
+    $newNode.SetAttribute("version", $version)
+    $newNode.InnerText = $text
+    [void]$contentListNode.AppendChild($newNode)
+    $nodeMap[$contentUid] = $newNode
+    $addedEntries.Add($contentUid) | Out-Null
+}
+
+$settings = New-Object System.Xml.XmlWriterSettings
+$settings.Encoding = New-Object System.Text.UTF8Encoding($true)
+$settings.Indent = $true
+$settings.IndentChars = "  "
+$settings.NewLineChars = "`n"
+$settings.NewLineHandling = [System.Xml.NewLineHandling]::Replace
+
+$writer = [System.Xml.XmlWriter]::Create($russianDocument.Path, $settings)
+try {
+    $russianDocument.Xml.WriteTo($writer)
+} finally {
+    $writer.Dispose()
+}
+
+try {
+    & $validateScriptPath -XmlPath $temporaryRussianPath
+    Move-Item -LiteralPath $temporaryRussianPath -Destination $RussianPath -Force
+} finally {
+    if (Test-Path -LiteralPath $temporaryRussianPath) {
+        Remove-Item -LiteralPath $temporaryRussianPath -Force
+    }
+}
+
+Write-Host "[apply-translation-edits.ps1] Updated entries: $($updatedEntries.Count); Added entries: $($addedEntries.Count)."
+if ($updatedEntries.Count -gt 0) {
+    Write-Host "[apply-translation-edits.ps1] Updated contentuid: $($updatedEntries -join ', ')"
+}
+if ($addedEntries.Count -gt 0) {
+    Write-Host "[apply-translation-edits.ps1] Added contentuid: $($addedEntries -join ', ')"
+}
diff --git a/scripts/compare-translation.ps1 b/scripts/compare-translation.ps1
new file mode 100644
index 0000000..5ace86f
--- /dev/null
+++ b/scripts/compare-translation.ps1
@@ -0,0 +1,203 @@
+param(
+    [string]$EnglishPath = ".cache/upstream/english.xml",
+    [string]$RussianPath = "Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml",
+    [string]$OutputDir = "build/translation-diff"
+)
+
+$ErrorActionPreference = "Stop"
+
+function Get-LocalizationEntries {
+    param(
+        [Parameter(Mandatory = $true)]
+        [string]$Path
+    )
+
+    $resolvedPath = [System.IO.Path]::GetFullPath($Path)
+    if (-not (Test-Path -LiteralPath $resolvedPath)) {
+        throw "Localization XML was not found: '$resolvedPath'."
+    }
+
+    [xml]$xml = Get-Content -LiteralPath $resolvedPath -Raw
+    $nodes = $xml.SelectNodes('/contentList/content')
+    if ($null -eq $nodes) {
+        throw "Localization XML does not contain '/contentList/content' nodes: '$resolvedPath'."
+    }
+
+    $entries = @{}
+    foreach ($node in $nodes) {
+        $contentUid = [string]$node.GetAttribute("contentuid")
+        if ([string]::IsNullOrWhiteSpace($contentUid)) {
+            continue
+        }
+
+        $entries[$contentUid] = [ordered]@{
+            contentuid = $contentUid
+            version = [string]$node.GetAttribute("version")
+            text = [string]$node.InnerText
+        }
+    }
+
+    return $entries
+}
+
+$resolvedOutputDir = [System.IO.Path]::GetFullPath($OutputDir)
+New-Item -ItemType Directory -Path $resolvedOutputDir -Force | Out-Null
+
+$englishEntries = Get-LocalizationEntries -Path $EnglishPath
+$russianEntries = Get-LocalizationEntries -Path $RussianPath
+
+$englishKeys = [System.Collections.Generic.HashSet[string]]::new([string[]]$englishEntries.Keys)
+$russianKeys = [System.Collections.Generic.HashSet[string]]::new([string[]]$russianEntries.Keys)
+
+$missingInRussian = New-Object System.Collections.Generic.List[object]
+$versionMismatch = New-Object System.Collections.Generic.List[object]
+$staleOnlyInRussian = New-Object System.Collections.Generic.List[object]
+
+foreach ($contentUid in ($englishEntries.Keys | Sort-Object)) {
+    $englishEntry = $englishEntries[$contentUid]
+    if (-not $russianEntries.ContainsKey($contentUid)) {
+        $missingInRussian.Add([pscustomobject]@{
+            contentuid = $contentUid
+            englishVersion = $englishEntry.version
+            englishText = $englishEntry.text
+        }) | Out-Null
+        continue
+    }
+
+    $russianEntry = $russianEntries[$contentUid]
+    if ($englishEntry.version -ne $russianEntry.version) {
+        $versionMismatch.Add([pscustomobject]@{
+            contentuid = $contentUid
+            englishVersion = $englishEntry.version
+            russianVersion = $russianEntry.version
+            englishText = $englishEntry.text
+            russianText = $russianEntry.text
+        }) | Out-Null
+    }
+}
+
+foreach ($contentUid in ($russianEntries.Keys | Sort-Object)) {
+    if (-not $englishEntries.ContainsKey($contentUid)) {
+        $russianEntry = $russianEntries[$contentUid]
+        $staleOnlyInRussian.Add([pscustomobject]@{
+            contentuid = $contentUid
+            russianVersion = $russianEntry.version
+            russianText = $russianEntry.text
+        }) | Out-Null
+    }
+}
+
+$summary = [ordered]@{
+    generatedAt = (Get-Date).ToString("o")
+    englishPath = [System.IO.Path]::GetFullPath($EnglishPath)
+    russianPath = [System.IO.Path]::GetFullPath($RussianPath)
+    englishCount = $englishEntries.Count
+    russianCount = $russianEntries.Count
+    missingInRussianCount = $missingInRussian.Count
+    versionMismatchCount = $versionMismatch.Count
+    staleOnlyInRussianCount = $staleOnlyInRussian.Count
+    missingInRussian = $missingInRussian
+    versionMismatch = $versionMismatch
+    staleOnlyInRussian = $staleOnlyInRussian
+}
+
+$summaryJsonPath = Join-Path $resolvedOutputDir "summary.json"
+$summaryMdPath = Join-Path $resolvedOutputDir "summary.md"
+$candidatesJsonPath = Join-Path $resolvedOutputDir "candidates.json"
+
+$summary | ConvertTo-Json -Depth 6 | Set-Content -LiteralPath $summaryJsonPath -Encoding utf8
+
+$candidates = [ordered]@{
+    generatedAt = (Get-Date).ToString("o")
+    source = [ordered]@{
+        englishPath = [System.IO.Path]::GetFullPath($EnglishPath)
+        russianPath = [System.IO.Path]::GetFullPath($RussianPath)
+    }
+    updates = @(
+        $versionMismatch | ForEach-Object {
+            [ordered]@{
+                contentuid = $_.contentuid
+                version = $_.englishVersion
+                text = $_.russianText
+                englishText = $_.englishText
+                russianVersion = $_.russianVersion
+            }
+        }
+    )
+    adds = @(
+        $missingInRussian | ForEach-Object {
+            [ordered]@{
+                contentuid = $_.contentuid
+                version = $_.englishVersion
+                text = ""
+                englishText = $_.englishText
+            }
+        }
+    )
+}
+
+$candidates | ConvertTo-Json -Depth 6 | Set-Content -LiteralPath $candidatesJsonPath -Encoding utf8
+
+$isUpToDate = ($missingInRussian.Count -eq 0) -and ($versionMismatch.Count -eq 0) -and ($staleOnlyInRussian.Count -eq 0)
+
+$mdLines = @(
+    "# Translation diff summary",
+    "",
+    "- Generated: $($summary.generatedAt)",
+    "- English entries: $($summary.englishCount)",
+    "- Russian entries: $($summary.russianCount)",
+    "- Missing in Russian: $($summary.missingInRussianCount)",
+    "- Version mismatches: $($summary.versionMismatchCount)",
+    "- Stale only in Russian: $($summary.staleOnlyInRussianCount)",
+    ""
+)
+
+if ($isUpToDate) {
+    $mdLines += "Перевод уже актуален, дополнительные действия не требуются."
+} else {
+    $mdLines += ""
+    $mdLines += "## Local workflow"
+    $mdLines += "1. Update upstream cache: ``scripts/get-upstream-english.ps1``"
+    $mdLines += "2. Refresh diff: ``scripts/compare-translation.ps1``"
+    $mdLines += "3. Edit ``build/translation-diff/candidates.json``"
+    $mdLines += "4. Apply changes: ``scripts/apply-translation-edits.ps1 -EditsPath build/translation-diff/candidates.json``"
+}
+
+$mdLines += ""
+$mdLines += "## Missing in Russian"
+if ($missingInRussian.Count -eq 0) {
+    $mdLines += "- none"
+} else {
+    $mdLines += ($missingInRussian | Select-Object -First 50 | ForEach-Object {
+        "- ``$($_.contentuid)`` v$($_.englishVersion): $($_.englishText)"
+    })
+}
+
+$mdLines += ""
+$mdLines += "## Version mismatches"
+if ($versionMismatch.Count -eq 0) {
+    $mdLines += "- none"
+} else {
+    $mdLines += ($versionMismatch | Select-Object -First 50 | ForEach-Object {
+        "- ``$($_.contentuid)`` en=v$($_.englishVersion), ru=v$($_.russianVersion)"
+    })
+}
+
+$mdLines += ""
+$mdLines += "## Stale only in Russian"
+if ($staleOnlyInRussian.Count -eq 0) {
+    $mdLines += "- none"
+} else {
+    $mdLines += ($staleOnlyInRussian | Select-Object -First 50 | ForEach-Object {
+        "- ``$($_.contentuid)`` v$($_.russianVersion): $($_.russianText)"
+    })
+}
+
+Set-Content -LiteralPath $summaryMdPath -Value $mdLines -Encoding utf8
+
+Write-Host "[compare-translation.ps1] Summary written to '$summaryJsonPath' and '$summaryMdPath'."
+Write-Host "[compare-translation.ps1] Editable candidate file written to '$candidatesJsonPath'."
+Write-Host "[compare-translation.ps1] Missing=$($missingInRussian.Count); VersionMismatch=$($versionMismatch.Count); StaleOnlyInRussian=$($staleOnlyInRussian.Count)."
+if ($isUpToDate) {
+    Write-Host "[compare-translation.ps1] Перевод уже актуален, дополнительные действия не требуются."
+}
diff --git a/scripts/get-upstream-english.ps1 b/scripts/get-upstream-english.ps1
new file mode 100644
index 0000000..1c7acc6
--- /dev/null
+++ b/scripts/get-upstream-english.ps1
@@ -0,0 +1,44 @@
+param(
+    [string]$UpstreamEnglishUrl = "https://raw.githubusercontent.com/Yoonmoonsik/dnd55e/main/Mods/DnD2024_897914ef-5c96-053c-44af-0be823f895fe/Localization/English/english.xml",
+    [string]$OutputPath = ".cache/upstream/english.xml",
+    [switch]$Force
+)
+
+$ErrorActionPreference = "Stop"
+
+if ([string]::IsNullOrWhiteSpace($UpstreamEnglishUrl)) {
+    throw "UpstreamEnglishUrl must not be empty."
+}
+
+$resolvedOutputPath = [System.IO.Path]::GetFullPath($OutputPath)
+$outputDirectory = Split-Path -Parent $resolvedOutputPath
+if (-not (Test-Path -LiteralPath $outputDirectory)) {
+    New-Item -ItemType Directory -Path $outputDirectory -Force | Out-Null
+}
+
+$requestParameters = @{
+    Uri = $UpstreamEnglishUrl
+    OutFile = $resolvedOutputPath
+    UseBasicParsing = $true
+    TimeoutSec = 120
+}
+
+if ($Force) {
+    $requestParameters["Headers"] = @{
+        "Cache-Control" = "no-cache"
+    }
+}
+
+Invoke-WebRequest @requestParameters
+
+[xml]$englishXml = Get-Content -LiteralPath $resolvedOutputPath -Raw
+$rootNode = $englishXml.SelectSingleNode('/contentList')
+if ($null -eq $rootNode) {
+    throw "Downloaded file is not a valid BG3 localization XML: '$resolvedOutputPath'."
+}
+
+$contentCount = $englishXml.SelectNodes('/contentList/content').Count
+$fileInfo = Get-Item -LiteralPath $resolvedOutputPath
+
+Write-Host "[get-upstream-english.ps1] Saved upstream english.xml to '$resolvedOutputPath'."
+Write-Host "[get-upstream-english.ps1] Entries: $contentCount; Size: $($fileInfo.Length) bytes; Updated: $($fileInfo.LastWriteTime.ToString("o"))."
diff --git a/scripts/update-translation.ps1 b/scripts/update-translation.ps1
new file mode 100644
index 0000000..3fca16f
--- /dev/null
+++ b/scripts/update-translation.ps1
@@ -0,0 +1,70 @@
+param(
+    [string]$RussianPath = "Mods/DnD 5.5e AIO Russian/Localization/Russian/russian.xml",
+    [string]$EnglishPath = ".cache/upstream/english.xml",
+    [string]$OutputDir = "build/translation-diff",
+    [string]$EditsPath = ""
+)
+
+$ErrorActionPreference = "Stop"
+
+$getUpstreamScriptPath = Join-Path $PSScriptRoot "get-upstream-english.ps1"
+$compareScriptPath = Join-Path $PSScriptRoot "compare-translation.ps1"
+$applyScriptPath = Join-Path $PSScriptRoot "apply-translation-edits.ps1"
+
+foreach ($scriptPath in @($getUpstreamScriptPath, $compareScriptPath, $applyScriptPath)) {
+    if (-not (Test-Path -LiteralPath $scriptPath)) {
+        throw "Required script was not found: '$scriptPath'."
+    }
+}
+
+$resolvedOutputDir = [System.IO.Path]::GetFullPath($OutputDir)
+$resolvedProvidedEditsPath = ""
+if (-not [string]::IsNullOrWhiteSpace($EditsPath)) {
+    $resolvedProvidedEditsPath = [System.IO.Path]::GetFullPath($EditsPath)
+}
+$workingDiffDir = Join-Path $env:TEMP ("bg3-translation-update-" + [guid]::NewGuid().ToString("N"))
+New-Item -ItemType Directory -Path $workingDiffDir -Force | Out-Null
+
+try {
+    & $getUpstreamScriptPath -OutputPath $EnglishPath -Force
+    & $compareScriptPath -EnglishPath $EnglishPath -RussianPath $RussianPath -OutputDir $workingDiffDir
+
+    New-Item -ItemType Directory -Path $resolvedOutputDir -Force | Out-Null
+    Get-ChildItem -LiteralPath $workingDiffDir | ForEach-Object {
+        $destinationPath = Join-Path $resolvedOutputDir $_.Name
+        if ($resolvedProvidedEditsPath -and ([System.IO.Path]::GetFullPath($destinationPath) -eq $resolvedProvidedEditsPath) -and (Test-Path -LiteralPath $resolvedProvidedEditsPath)) {
+            return
+        }
+        Copy-Item -LiteralPath $_.FullName -Destination $resolvedOutputDir -Recurse -Force
+    }
+
+    $summaryJsonPath = Join-Path $workingDiffDir "summary.json"
+    if (-not (Test-Path -LiteralPath $summaryJsonPath)) {
+        throw "Translation summary was not found: '$summaryJsonPath'."
+    }
+
+    $summary = Get-Content -LiteralPath $summaryJsonPath -Raw | ConvertFrom-Json -Depth 10
+    $hasDiff = ($summary.missingInRussianCount -gt 0) -or ($summary.versionMismatchCount -gt 0) -or ($summary.staleOnlyInRussianCount -gt 0)
+
+    if (-not $hasDiff) {
+        Write-Host "[update-translation.ps1] Перевод уже актуален, дополнительные действия не требуются."
+        return
+    }
+
+    $effectiveEditsPath = $EditsPath
+    if ([string]::IsNullOrWhiteSpace($effectiveEditsPath)) {
+        $effectiveEditsPath = Join-Path $resolvedOutputDir "candidates.json"
+    }
+
+    if (-not (Test-Path -LiteralPath $effectiveEditsPath)) {
+        throw "Translation changes were found. Prepare edits in '$([System.IO.Path]::GetFullPath((Join-Path $resolvedOutputDir "candidates.json")))' and rerun update with '-EditsPath'."
+    }
+
+    & $applyScriptPath -RussianPath $RussianPath -EditsPath $effectiveEditsPath
+
+    Write-Host "[update-translation.ps1] Обновление перевода завершено. Результат записан в '$([System.IO.Path]::GetFullPath($RussianPath))'."
+} finally {
+    if (Test-Path -LiteralPath $workingDiffDir) {
+        Remove-Item -LiteralPath $workingDiffDir -Recurse -Force
+    }
+}
diff --git a/scripts/validate-translation-xml.ps1 b/scripts/validate-translation-xml.ps1
new file mode 100644
index 0000000..e2094b7
--- /dev/null
+++ b/scripts/validate-translation-xml.ps1
@@ -0,0 +1,41 @@
+param(
+    [Parameter(Mandatory = $true)]
+    [string]$XmlPath
+)
+
+$ErrorActionPreference = "Stop"
+
+$resolvedXmlPath = [System.IO.Path]::GetFullPath($XmlPath)
+if (-not (Test-Path -LiteralPath $resolvedXmlPath)) {
+    throw "XML file was not found: '$resolvedXmlPath'."
+}
+
+[xml]$xml = Get-Content -LiteralPath $resolvedXmlPath -Raw
+$contentListNode = $xml.SelectSingleNode('/contentList')
+if ($null -eq $contentListNode) {
+    throw "XML validation failed: missing '/contentList' in '$resolvedXmlPath'."
+}
+
+$contentNodes = $xml.SelectNodes('/contentList/content')
+if ($null -eq $contentNodes -or $contentNodes.Count -lt 1) {
+    throw "XML validation failed: no '/contentList/content' entries found in '$resolvedXmlPath'."
+}
+
+$seen = [System.Collections.Generic.HashSet[string]]::new()
+foreach ($node in $contentNodes) {
+    $contentUid = [string]$node.GetAttribute("contentuid")
+    if ([string]::IsNullOrWhiteSpace($contentUid)) {
+        throw "XML validation failed: found content node without 'contentuid' in '$resolvedXmlPath'."
+    }
+
+    if (-not $seen.Add($contentUid)) {
+        throw "XML validation failed: duplicate contentuid '$contentUid' in '$resolvedXmlPath'."
+    }
+
+    $version = [string]$node.GetAttribute("version")
+    if ([string]::IsNullOrWhiteSpace($version)) {
+        throw "XML validation failed: contentuid '$contentUid' has empty 'version' in '$resolvedXmlPath'."
+    }
+}
+
+Write-Host "[validate-translation-xml.ps1] XML is valid: '$resolvedXmlPath'. Entries=$($contentNodes.Count)."