allow underscore in ALIAS name (Fixes: #3866)

Florian Schaal

2016-04-30 8beb039f0b7d23b03f7963c3a56c8dde65af3b6b

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<?php
$wb['faq_faq_txt'] = 'Често Задавани Въпроси';
$wb['faq_question_txt'] = 'Въпрос';
$wb['faq_answer_txt'] = 'Отговор';
$wb['faq_section_txt'] = 'Секция';
?>