/usr/share/locale/C/props/basic_setting is in xview-clients 3.2p1.4-28.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# @(#)basic_setting 1.5 91/09/14;SMI
#
# Workspace Properties Localization Panel configuration file - Basic Setting
#
# Basic Setting for the C locale
#
# LC_MESSAGES="C" -> display language is English
#
# Category_name=default_value,value:label[[,value:label]...]
#
basic_setting=C;C|U.S.A.
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