postinst is in locales 2.13+git20120306-3.
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 6 7 8 9 10 11 12 13 | #! /bin/sh -e
if [ "$1" = configure ]; then
# in this version we switched to using an archive, so clean up
if dpkg --compare-versions "$2" lt-nl "2.11+git20100304-5"; then
rm -rf /usr/lib/locale/*
fi
locale-gen
fi
exit 0
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