As you can see here: http://svnweb.mageia.org/web/www/trunk/langs/el/there are missing many .lang files compare to http://svnweb.mageia.org/web/www/trunk/langs/en/How can i get these files ?
Download English files, translate them, commit them. There is also convenient page for this: http://www.mageia.org/langs/report.php Hope this helps. Best regards, Yuri
