[ADF-3193] CardView Variables Item (#3485)

* variables item

* unit tests

* translations fix

* docs added

* change requests

* change requests

lib/core/card-view/models/card-view-keyvaluepairs.model.ts

@@ -0,0 +1,33 @@
+/*!
+ * @license
+ * Copyright 2016 Alfresco Software, Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { CardViewItem } from '../interfaces/card-view-item.interface';
+import { DynamicComponentModel } from '../../services/dynamic-component-mapper.service';
+import { CardViewBaseItemModel } from './card-view-baseitem.model';
+import { CardViewKeyValuePairsItemProperties } from '../interfaces/card-view.interfaces';
+
+export class CardViewKeyValuePairsItemModel extends CardViewBaseItemModel implements CardViewItem, DynamicComponentModel {
+    type: string = 'keyvaluepairs';
+
+    constructor(obj: CardViewKeyValuePairsItemProperties) {
+        super(obj);
+    }
+
+    get displayValue() {
+        return this.value;
+    }
+}