Fix incorrect use of gettext in argparse (#10497).

Steven, the maintainer of argparse, agreed to have this committed
without tests for now, since the fix is obvious.  See the bug log.
diff --git a/Misc/NEWS b/Misc/NEWS
index b0221cb..d2e4fa8 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -35,6 +35,8 @@
 Library
 -------
 
+- Issue #10497: Fix incorrect use of gettext in argparse.
+
 - Issue #10478: Reentrant calls inside buffered IO objects (for example by
   way of a signal handler) now raise a RuntimeError instead of freezing the
   current process.