Revert "Merge branch 'adding-htmlspecialchars-to-h5p' into without-pal"

This reverts commit 9f19f64bab, reversing
changes made to 38c98202f4.

js/h5p.js

@@ -975,13 +975,6 @@ H5P.setFinished = function (contentId, points, maxPoints) {
   }
 };
 
-/**
- * Mimics how php's htmlspecialchars works (the way we use it)
- */
-H5P.htmlspecialchars = function(string) {
-  return string.toString().replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/'/g, '&#039;').replace(/"/g, '&quot;');
-};
-
 // Add indexOf to browsers that lack them. (IEs)
 if (!Array.prototype.indexOf) {
   Array.prototype.indexOf = function (needle) {