This file is indexed.

/usr/src/glibc/debian/debhelper.in/locales.README.Debian is in eglibc-source 2.19-0ubuntu6.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
locales
-------

  * Starting with locales 2.7-3, users can provide their own locales in
    addition to the ones provided by the package. They will be handled 
    as other locales in the various scripts.

    Each user defined locale has to be provided as a single file and 
    placed in the /usr/local/share/i18n/locales/ directory. The list of
    user defined locales should be placed, one by line, in the file
    /usr/local/share/i18n/SUPPORTED. You can have a look to the locales
    provided by the locales package in /usr/share/i18n/ for more details.

    To enable the new locales, just run 'dpkg-reconfigure locales' and 
    select the new locales.

 -- Aurelien Jarno <aurel32@debian.org>  Thu 29 Nov 2007 18:54:12 +0100