Fix #10682: Meta description and keywords transform to html entities

Changed the htmlentities function to the htmlspecialchars function. It's not necessary to do HTML encoding on all characters as described in #10682. Since the content is used within HTML tags, we still need to encode special HTML chars in order to make sure that chars like "'& etc, will not break the page.

Author: dverkade

lib/internal/Magento/Framework/View/Page/Config.php

@@ -226,7 +226,7 @@ public function getTitle()
     public function setMetadata($name, $content)
     {
         $this->build();
-        $this->metadata[$name] = htmlentities($content);
+        $this->metadata[$name] = htmlspecialchars($content);
     }
 
     /**