[loc] set up Windows Store listing translations (part 1)

* MSG_900+ will be used for Windows Store translation, so add them
  and makes sure these get filtered out from embedded.loc.
* Also make sure we don't get a "Translated by:" in the English version
  when compiled with VS2022.
* Also add Store screenshots and update listing.csv so that we can
  autogenerate and upload a complete translation update to the store.

res/appstore/listing/.editorconfig

@@ -0,0 +1,8 @@
+# indicate this is the root of the project
+root = true
+
+[*]
+charset = utf-8-bom
+insert_final_newline = true
+indent_style = space
+trim_trailing_whitespace = true

res/appstore/listing/runme.ps1

@@ -0,0 +1,31 @@
+# PowerShell script to parse listing.csv and retrieve our screenshots
+try {
+  [Console]::OutputEncoding = [System.Text.Encoding]::UTF8
+} catch {}
+
+# NB: All languages IDs from the .csv are lowercase version of the one
+# from rufus.loc, except for 'sr-RS' that becomes 'sr-latn-rs'. 
+
+function GetCellByName([object]$csv, [string]$row_name, [string]$column_name)
+{
+  foreach ($row in $csv | Where-Object {$_.Field -eq $row_name}) {
+    foreach ($column in $row.PSObject.properties) {
+      if ($column.name -eq $column_name) {
+        return $column.value
+      }
+    }
+  }
+  return [string]::Empty
+} 
+
+$csv = Import-Csv -Path .\listing.csv
+$langs = $csv | Select-Object -First 1 | Select * -ExcludeProperty 'Field','ID','Type (Type)','default' | ForEach-Object { $_.PSObject.Properties } | Select-Object -ExpandProperty Name
+
+foreach ($lang in $langs) {
+  $null = New-Item $lang -ItemType Directory -Force
+  $url = GetCellByName $csv 'DesktopScreenshot1' $lang
+  # Annoying but heck if I'm gonna bother with Microsoft's Auth in PowerShell...
+  Start-Process -NoNewWindow -FilePath "C:\Program Files\Mozilla Firefox\firefox.exe" -ArgumentList "-new-tab $url"
+  Write-Host $lang;
+  $null = $Host.UI.RawUI.ReadKey('NoEcho,IncludeKeyDown');
+}