Move escapeHtml to utils.

Signed-off-by: XhmikosR <xhmikosr@gmail.com>

scripts/pi-hole/js/utils.js

@@ -7,6 +7,21 @@
 
 /* global moment:false */
 
+// Credit: https://stackoverflow.com/questions/1787322/htmlspecialchars-equivalent-in-javascript/4835406#4835406
+function escapeHtml(text) {
+  var map = {
+    "&": "&",
+    "<": "&lt;",
+    ">": "&gt;",
+    '"': "&quot;",
+    "'": "&#039;"
+  };
+
+  return text.replace(/[&<>"']/g, function (m) {
+    return map[m];
+  });
+}
+
 var info = null;
 function showAlert(type, icon, title, message) {
   var opts = {};
@@ -172,6 +187,7 @@ function stateLoadCallback(itemName) {
 
 window.utils = (function () {
   return {
+    escapeHtml: escapeHtml,
     showAlert: showAlert,
     datetime: datetime,
     disableAll: disableAll,