/usr/share/language-tools/language-validate is in accountsservice 0.6.40-2ubuntu10.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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lang=$1
validated_language=
test -n "$lang" || exit 1
langtoolsdir=/usr/share/language-tools
#
# discard possible fallback languages
#
lang=${lang%%:*}
#
# remove possible encoding part
#
if [ $lang != ${lang%.utf8*} ]; then
lang=${lang%.*}${lang#*.utf8}
elif [ $lang != ${lang%.UTF-8*} ]; then
lang=${lang%.*}${lang#*.UTF-8}
fi
#
# make sure that the output is a valid language option
#
options=$( $langtoolsdir/language-options )
# exact match
for opt in $options; do
if [ $opt = $lang ]; then
validated_language=$lang
break
fi
done
if [ -z "$validated_language" ]; then
langcode=${lang%%[_@]*}
# try the "main" country code if any
main_country=
is_variant=false
while read line; do
if [ "${line%%[[:space:]]*}" = $langcode ]; then
main_country=${line##*[[:space:]]}
if [ $lang != ${lang#*@} ]; then
main_country=$main_country@${lang#*@}
is_variant=true
fi
break
fi
done < $langtoolsdir/main-countries
if [ -n "$main_country" ]; then
for opt in $options; do
if [ $main_country = $opt ]; then
validated_language=$main_country
break
fi
done
fi
# try out fitting language option without paying regard to
# country code
if [ -z "$validated_language" ]; then
for opt in $options; do
if [ "${opt%%[_@]*}" = $langcode -a $langcode != 'zh' ]; then
if $is_variant && [ $opt = ${opt#*@} ]; then
continue
fi
validated_language=$opt
break
fi
done
fi
fi
if [ -z "$validated_language" ]; then
validated_language='en'
fi
echo $validated_language
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