Binary package “locales” in ubuntu bionic

GNU C Library: National Language (locale) data [support]

 Machine-readable data files, shared objects and programs used by the
 C library for localization (l10n) and internationalization (i18n) support.
 This package contains tools to generate locale definitions from source
 files (included in this package). It allows you to customize which
 definitions actually get generated. This is a space-saver over how this
 package used to be, with all locales generated by default. This created
 a package that unpacked to an excess of 30 megs.