changed regex for backup_dir (allow empty backup-dir to disable backups)

Florian Schaal

2016-03-17 93e7c2d51119be25b34fec4b2eb5771f40cf7d31

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<?php
$wb['list_head_txt'] = 'Mail traffic';
$wb['email_txt'] = 'Email';
$wb['this_month_txt'] = 'This month';
$wb['last_month_txt'] = 'Last month';
$wb['this_year_txt'] = 'This year';
$wb['last_year_txt'] = 'Last year';
?>