List messages without documentation in mediawiki i18n files

undocumentedmessages.php

<?php
if ( PHP_SAPI !== 'cli' )
{
	exit( 1 );
}
if( !isset($argv[1]) || $argv[1] === "-h" ){
	echo "Usage: php undocumentedmessages.php i18nfile \n";
	exit( 0 );
}
$i18nfile = $argv[1];
include( $i18nfile );
foreach ( $messages['en'] as $messageKey => $messageValue ) {
	$searchstr = $messageKey;
	if ( !isset($messages['qqq'][ $messageKey] ) ) {
		echo $i18nfile . " : " . $messageKey . "\n";
	}
}