#! /usr/bin/perl -i
my $header = 1;
while (<>) {
    if ((/^msgid/) && not (/^msgid "(?:default:LTR|24-hour|%.*)"$/)) {
	if ($header) {
	    $header = 0;
	} elsif (/^msgid "_(?:Back|Forward)"$/) {
	    print qq{msgctxt "Stock label, navigation"\n};
	} else {
	    print qq{msgctxt "Stock label"\n};
	}
    }
    print;
}