The %postun scriptlet is buggy: It deletes /usr/lib/locale/locale-archive during package updates, not just during uninstallation. As a result, it is currently very difficult to update to a glibc-all-langpacks package which installs this file. See bug 1716710. We should perform the deletion only if arg[2] == 0 (which signifies uninstallation).
We also need to drop the %config attribute to avoid creating .rpmsave files in the future.
Verified, glibc-lang-langpacks removes locale archive during uninstallation.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2019:3513