Add basic permission check to exporter

pages/export.php

@@ -2,8 +2,13 @@
 require_once __DIR__ . '/../required.php';
 
 redirectifnotloggedin();
-?>
 
+if (!account_has_permission($_SESSION['username'], "QWIKCLOCK_MANAGE")) {
+    ?>
+<div class="alert alert-danger"><?php lang("missing permission") ?></div>
+    <?php
+} else {
+    ?>
     <form action="lib/reports.php" method="GET" target="_BLANK">
         <div class="row">
             <div class="col-xs-12 col-sm-6 col-md-4">
@@ -46,3 +51,6 @@ redirectifnotloggedin();
 
         <button type="submit" class="btn btn-success" id="genrptbtn"><i class="fa fa-download"></i> <?php lang("generate report"); ?></button>
     </form>
+    <?php
+}
+?>