Rename private attribute _element to _el

Change-Id: I9c7a31bd6844636737ffa6456562b997f5e370a3
diff --git a/dev/js/src/view.js b/dev/js/src/view.js
index 77f8d60..a8a79cb 100644
--- a/dev/js/src/view.js
+++ b/dev/js/src/view.js
@@ -43,9 +43,9 @@
      * Element of the view
      */
     element : function () {
-      if (this._element) {
-        this._element.classList.add('show');
-        return this._element;
+      if (this._el) {
+        this._el.classList.add('show');
+        return this._el;
       };
 
       // Create panel element
@@ -70,7 +70,7 @@
 
       e.appendChild(this.actions.element());
 
-      return this._element = e;
+      return this._el = e;
     },
 
 
@@ -86,8 +86,8 @@
      * Hide the widget if shown.
      */
     minimize : function () {
-      if (this._element) {
-        this._element.classList.remove("show");
+      if (this._el) {
+        this._el.classList.remove("show");
       }
     },