Added PHP 7 check in installer and updater.

Till Brehm

2016-04-22 ebd0e986ed11f2a34fb58cdd33efbfab192083ad

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<?php 
$wb["list_head_txt"] = 'Email templates'; 
$wb["template_type_txt"] = 'Message for'; 
$wb["template_name_txt"] = 'Template name'; 
?>