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

Florian Schaal

2016-05-26 52a8e7e2f53b23f41b40aa5bc5b35f338aaec3dd

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<?php
$wb["head_txt"] = 'Install software package';
$wb["install_key_txt"] = 'Enter install key';
$wb["btn_save_txt"] = 'Start Installation';
$wb["btn_cancel_txt"] = 'Cancel';
?>