Allow translators to reorder placeholders in localizable messages from
argparse (#10528).

There is no unit test; I checked with xgettext that no more warnings
were emitted.  Steven approved the change.
diff --git a/Misc/NEWS b/Misc/NEWS
index d2e4fa8..4576fb3 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -35,6 +35,9 @@
 Library
 -------
 
+- Issue #10528: Allow translators to reorder placeholders in localizable
+  messages from argparse.
+
 - Issue #10497: Fix incorrect use of gettext in argparse.
 
 - Issue #10478: Reentrant calls inside buffered IO objects (for example by