Added allowempty setting to ISEMAIL validator.

Till Brehm

2016-01-29 a8ab61eeb0beac52d5a1e8c41d549df4ed87bf71

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<?php
$wb['head_txt'] = 'Softwarepaket installieren';
$wb['install_key_txt'] = 'Installationskey eingeben';
$wb['btn_save_txt'] = 'Installation starten';
$wb['btn_cancel_txt'] = 'Abbrechen';
?>