This file is indexed.

/usr/lib/tasksel/tests/lang is in tasksel 2.88ubuntu9.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# Hide all language tasks, and select any that match the current LANG
# setting for installation.
if [ "$NEW_INSTALL" ]; then
	set -e
	shift 1
	baselang=${LANG%%_*}
	fulllang=${LANG%%.*}
	for locale in $@; do
		if ( [ -n "$LANG" ] && [ "$LANG" = "$locale" ] ) || \
		   ( [ -n "$fulllang" ] && [ "$fulllang" = "$locale" ] ) || \
		   ( [ -n "$baselang" ] && [ "$baselang" = "$locale" ] ); then
		   exit 0 # install without display
		fi
	done
	exit 1 # do not display
else
	exit 1
fi