prevent empty support messages in help module (Fixes: #3697)

Florian Schaal

2016-05-26 52a8e7e2f53b23f41b40aa5bc5b35f338aaec3dd

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<?php
$wb['welcome_user_txt'] = 'Buongiorno %s';
$wb['available_modules_txt'] = 'Moduli disponibili';
?>