allow underscore in ALIAS name (Fixes: #3866)

Florian Schaal

2016-04-30 8beb039f0b7d23b03f7963c3a56c8dde65af3b6b

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<?php
$wb['list_head_txt'] = 'E-mailové šablony';
$wb['template_type_txt'] = 'Zpráva pro';
$wb['template_name_txt'] = 'Název šablony';
?>