* 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.
* Update the relevant loc messages.
* Also add a -z commandline option to force the Windows version (but without letting
this option work as an override, if running on an unsupported platform).
* Also fix typos and broken URLs.
