/usr/share/otrs/Kernel/Language/en.pm is in otrs2 5.0.7-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2001-2016 OTRS AG, http://otrs.com/
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (AGPL). If you
# did not receive this file, see http://www.gnu.org/licenses/agpl.txt.
# --
package Kernel::Language::en;
use strict;
use warnings;
use utf8;
sub Data {
    my $Self = shift;
    # http://en.wikipedia.org/wiki/Date_and_time_notation_by_country#United_States
    # month-day-year (e.g., "12/31/99")
    # $$START$$
    # Last translation file sync: Thu Apr  9 10:12:50 2009
    # possible charsets
    $Self->{Charset} = ['utf-8', ];
    # date formats (%A=WeekDay;%B=LongMonth;%T=Time;%D=Day;%M=Month;%Y=Year;)
    $Self->{DateFormat}          = '%M/%D/%Y %T';
    $Self->{DateFormatLong}      = '%T - %M/%D/%Y';
    $Self->{DateFormatShort}     = '%M/%D/%Y';
    $Self->{DateInputFormat}     = '%M/%D/%Y';
    $Self->{DateInputFormatLong} = '%M/%D/%Y - %T';
    $Self->{Separator}           = ',';
    $Self->{Translation} = {
        'May_long' => 'May',
    };
    # $$STOP$$
    return;
}
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