locale -a -v
Lists all locales and shows useful additional information (such as directories containing locale information data files)
$ locale -a -v
locale: en_US.utf8 archive: /usr/lib/locale/locale-archive
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title | English locale for the USA
source | Free Software Foundation, Inc.
address | https://www.gnu.org/software/libc/
email | bug-glibc-locales@gnu.org
language | American English
territory | United States
revision | 1.0
date | 2000-06-24
codeset | UTF-8
locale: C.UTF-8 directory: /usr/lib/locale/C.UTF-8
-------------------------------------------------------------------------------
title | C locale
email | aurel32@debian.org
language | C
revision | 1.6
date | 2016-08-08
codeset | UTF-8