Issue #23883: Add test.support.check__all__() and test gettext.__all__

Patches by Jacek Kołodziej.
diff --git a/Misc/ACKS b/Misc/ACKS
index 6341b23..934cba2 100644
--- a/Misc/ACKS
+++ b/Misc/ACKS
@@ -765,6 +765,7 @@
 Marko Kohtala
 Vajrasky Kok
 Guido Kollerie
+Jacek Kołodziej
 Jacek Konieczny
 Марк Коренберг
 Arkady Koplyarov