Rename private attribute _element to _el

Change-Id: I9c7a31bd6844636737ffa6456562b997f5e370a3
diff --git a/dev/js/src/plugin/server.js b/dev/js/src/plugin/server.js
index 19f8c5f..bc4eaaa 100644
--- a/dev/js/src/plugin/server.js
+++ b/dev/js/src/plugin/server.js
@@ -544,11 +544,11 @@
      * Return the service element.
      */
     element : function () {
-      if (!this._element) {
-        this._element = document.createElement('div');
-        this._element.setAttribute("id", "services");
+      if (!this._el) {
+        this._el = document.createElement('div');
+        this._el.setAttribute("id", "services");
       }
-      return this._element;
+      return this._el;
     },
     
     // Destructor, just for testing scenarios
@@ -565,12 +565,12 @@
         b => buttonsSingle[b] = []
       );
 
-      if (this._element) {
-        let e = this._element;
+      if (this._el) {
+        let e = this._el;
         if (e.parentNode) {
           e.parentNode.removeChild(e);
         };
-        this._element = null;
+        this._el = null;
       };
       
       this._removeListener();
diff --git a/dev/js/src/plugin/widget.js b/dev/js/src/plugin/widget.js
index 5f8ca9a..48cc393 100644
--- a/dev/js/src/plugin/widget.js
+++ b/dev/js/src/plugin/widget.js
@@ -32,8 +32,8 @@
     show : function () {
 
       if (this._load) {
-        if (this._element)
-          this._element.classList.add('show');
+        if (this._el)
+          this._el.classList.add('show');
         return this._load;
       }