translation using NGettext.Wpf

lang/update-po-and-pot-files.ps1

@@ -0,0 +1,18 @@
+
+# Write list of .cs files into cs-files.txt file
+Get-ChildItem $PSScriptRoot/.. -Recurse -File -Filter '*.cs' |
+    Where-Object { $_ -notmatch '[/\\]obj[/\\]' } |
+    ForEach-Object { $_.FullName } |
+    Out-File $PSScriptRoot/cs-files.txt
+
+# Create .pot file
+xgettext --force-po --from-code=UTF-8 '--language=c#' -o $PSScriptRoot/source.pot --files-from=$PSScriptRoot/cs-files.txt --keyword=_
+
+# Backup .po files
+$BackupTargetFolder = $env:TEMP + '/mpv.net po backup ' + (Get-Date -Format 'yyyy-MM-dd HH_mm_ss')
+Copy-Item $PSScriptRoot/po $BackupTargetFolder -Force -Recurse
+'PO file backup: ' + (Resolve-Path $BackupTargetFolder)
+
+# Update .po files
+(Get-ChildItem $PSScriptRoot/PO -Filter '*.po').FullName |
+    ForEach-Object { msgmerge --sort-output --backup=none --update $_ $PSScriptRoot/source.pot }