Added allowempty setting to ISEMAIL validator.

Till Brehm

2016-01-29 a8ab61eeb0beac52d5a1e8c41d549df4ed87bf71

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

@@ -7,3 +7,4 @@
$wb['btn_cancel_txt'] = 'Zpět';
?>