fix some strings quoting and remove some execs

jwarnier

2010-09-05 8e725d2c1057608431d3d1639c948206d5e24869

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<?php
$wb['recipient_id_txt'] = 'Empfänger ID';
$wb['sender_id_txt'] = 'Absender ID';
$wb['subject_txt'] = 'Betreff';
$wb['message_txt'] = 'Nachricht';
$wb['tstamp_txt'] = 'Zeitpunkt';
?>