Added allowempty setting to ISEMAIL validator.

Till Brehm

2016-01-29 a8ab61eeb0beac52d5a1e8c41d549df4ed87bf71

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<?php
$wb['faq_faq_txt'] = 'Frequently Asked Questions';
$wb['faq_question_txt'] = 'Question';
$wb['faq_answer_txt'] = 'Answer';
$wb['faq_section_txt'] = 'Section';
?>