/usr/share/kconf_update/fonts_kate.pl is in plasma-integration 5.12.4-0ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #! /usr/bin/perl
use strict;
while (<>)
{
chomp;
s/Font=Oxygen\ Mono/Font=Hack/;
print "$_\n";
}
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