Added PHP 7 check in installer and updater.

Till Brehm

2016-04-22 ebd0e986ed11f2a34fb58cdd33efbfab192083ad

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<?php
$wb["mailbox_spamfilter_txt"] = 'Spamfilter';
$wb["spamfilter_txt"] = 'Spamfilter';
$wb["email_txt"] = 'Email';
$wb["no_policy"] = '- not enabled -';
$wb["policy_txt"] = 'Policy';
?>