prerm is in manpages-es-extra 0.8a-19.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #! /bin/sh
set -e
if [ -x /usr/sbin/chmanconfig ]; then
chmanconfig --remove --lang=es
fi
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