The local documents are not currently internationalised simply
because the internationalised resources are not put into the right
places (NSBundle will handle this automatically when they are);
Trac#10464 is a tracking bug for this outstanding issue.
Fixes Trac#10437.
When -Wundeclared-selector is enabled (recommended by Apple), the
calls to the setBadgeLabel selector in MacOSXTaskbarManager are
warned on because NSDockTile declarations are not included because
they do not exist in macOS 10.4 and earlier. While I don't know
that we are even supporting such old macOS versions these days, it
is simple enough to fix this problem when compiling to modern
macOS versions by conditionally including the necessary header.
We remove the menus added by SDL before inserting our own menus,
but the code assumed that there were two SDL generated menus. SDL2
actually adds three menus. So the new code makes no assumptions on
the number of menus so that it works with both SDL1.2 and SDL2.
Also fix an issue on OS X 10.4 and earlier that caused the app menu
to be nameless.
