update translations

dashboard-ui/bower_components/iron-form-element-behavior/iron-form-element-behavior.html

@@ -15,15 +15,26 @@ Enables a custom element to be included in an `iron-form`.
 -->
 <script>
 
-  /** 
-  
+  /**
+
   @demo demo/index.html
-  @polymerBehavior 
-  
+  @polymerBehavior
+
   */
   Polymer.IronFormElementBehavior = {
 
     properties: {
+      /**
+       * Fired when the element is added to an `iron-form`.
+       *
+       * @event iron-form-element-register
+       */
+
+      /**
+       * Fired when the element is removed from an `iron-form`.
+       *
+       * @event iron-form-element-unregister
+       */
 
       /**
        * The name of this element.
@@ -39,10 +50,25 @@ Enables a custom element to be included in an `iron-form`.
         notify: true,
         type: String
       },
+
+      /**
+       * Need to keep a reference to the form this element is registered
+       * to, so that it can unregister if detached.
+       */
+      _parentForm: {
+        type: Object
+      }
     },
 
     attached: function() {
+      this._parentForm = Polymer.dom(this).parentNode;
       this.fire('iron-form-element-register');
+    },
+
+    detached: function() {
+      if (this._parentForm) {
+        this._parentForm.fire('iron-form-element-unregister', {target: this});
+      }
     }
 
   };