[ADF-4219] Multivalue Metadata Card View (#4600)

* [ADF-4219] Multivalue Metadata  Card View

* [ADF-4219] Add documentation

* [ADF-4219] Improve code, docs and tests

* [ADF-4219] Fix e2e tests

lib/core/pipes/multi-value.pipe.ts

@@ -0,0 +1,34 @@
+/*!
+ * @license
+ * Copyright 2019 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 { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({ name: 'multiValue' })
+export class MultiValuePipe implements PipeTransform {
+
+    static DEFAULT_SEPARATOR = ', ';
+
+    transform(values: string | string [], valueSeparator: string = MultiValuePipe.DEFAULT_SEPARATOR): string {
+
+        if (values && values instanceof Array) {
+            values.map((value) => value.trim());
+            return values.join(valueSeparator);
+        }
+
+        return <string> values;
+    }
+}