Win32 UI: Add a System Language menu that's dynamically created. Also fix several small bugs where the UI wouldn't switch languages on the Pause screen, and in a couple other spots.
Reorder the enum slightly.
Clarify a comment.
memset the MENUITEMINFO just to be safe.
Create the separator one position above the System Language menu instead of appending it.
Rename "System Language" to just "Language".
Move Language up to be a main menu item. It doesn't really belong anywhere else currently, but it could be moved later after the upcoming DesktopUI reorganization.
Move a few things around.
Merge pull request #3604 from thedax/dynamicUITranslation

Win32 UI: Add a runtime created Language submenu.