fix: carattere non supportato XML

Author: Pek5892

plugins/exportFE/src/Validator.php

@@ -930,7 +930,7 @@ public static function sanitizeXML2($string)
             '‥' => '..',
             '…' => '...',
             ' ' => ' ',
-            '″' => '′′',
+            '″' => '"',
             '‴' => '′′′',
             '‶' => '‵‵',
             '‷' => '‵‵‵',