pg_updatedicts makes dictionaries and affix files from installed myspell and hunspell dictionary packages
available to PostgreSQL for usage with tsearch and word stem support. In particular, it takes all *.dic
and *.aff files from /usr/share/myspell/dicts/, converts them to UTF-8, puts them into
/var/cache/postgresql/dicts/ with *.dict and *.affix suffixes, and symlinks them into
/usr/share/postgresql/version/tsearch_data/, where PostgreSQL looks for them.
Through postgresql-common's dpkg trigger, this program is automatically run whenever a myspell or
hunspell dictionary package is installed or upgraded.