allow empty servers (Fixes: #3874)

Florian Schaal

2016-05-04 cc08f2c13f7155d6f3fb11afa7661aaec676858a

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<?php
$wb['list_head_txt'] = 'Export language files';
$wb['language_select_txt'] = 'Select language';
$wb['btn_save_txt'] = 'Export the selected language file set';
$wb['btn_cancel_txt'] = 'Back';
?>