Added User validation in shell and web tform files.

Till Brehm

2014-08-13 93b75676ecc55ff703f920e3b6357dde4b1b884a

 interface/web/sites/form/web_domain.tform.php

@@ -603,7 +603,7 @@
                  1 => array(
                     'type' => 'CUSTOM',
                     'class' => 'validate_systemuser',
                     'function' => 'check_sysuser',
                     'function' => 'check_sysgroup',
                     'check_names' => true,
                     'errmsg' => 'invalid_system_user_or_group_txt'
                  ),