Config.php: more precise error message

extension/Source/core/store/Config.php

@@ -241,7 +241,7 @@ class Config {
                 $len = strlen($value);
                 if ($len > $maxLength) {
                     $attack = true;
-                    $reason .= "Get variable '$key' too long. Allowed: $maxLength, Length: $len - " . htmlentities($_GET[$key]) . PHP_EOL;
+                    $reason .= "Value of GET variable '$key' too long. Allowed: $maxLength, Length: $len. Value: '" . htmlentities($_GET[$key]) . "'" . PHP_EOL;
                 }
             }
         }