[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