Fixed vhostsubdomain not empty regex check to allow 1 char subdomains.

Till Brehm

2014-02-17 baa7f2736bc91ca3feaed685e8a67a46db4fbb98

 interface/web/admin/lib/lang/cz_system_config.lng

@@ -53,3 +53,4 @@
$wb['phpmyadmin_url_note_txt'] = 'Placeholder:';
$wb['webmail_url_note_txt'] = 'Placeholder:';
?>