Rename private attribute _element to _el

Change-Id: I9c7a31bd6844636737ffa6456562b997f5e370a3
diff --git a/dev/js/src/vc/statistic.js b/dev/js/src/vc/statistic.js
index 4dd5ab3..0fda3ba 100644
--- a/dev/js/src/vc/statistic.js
+++ b/dev/js/src/vc/statistic.js
@@ -38,9 +38,9 @@
      */
     element : function () {
 
-      // if this._element already exists return without doing something
-      if (this._element !== undefined) {
-        return this._element;
+      // if this._el already exists return without doing something
+      if (this._el !== undefined) {
+        return this._el;
       }
 
       // create HTML Description List Element
@@ -59,8 +59,8 @@
         statDD.addT(new Number(statistic[k]).toLocaleString());
       });
 
-      this._element = statDL;
-      return this._element;
+      this._el = statDL;
+      return this._el;
     }
   }