[ADF-4342] Create localized pipe and centralize date format (#4813)

* [ADF-4342] Date Format defined in app config

* [ADF-4342] Create localized pipe and centralize date format

* Add unit test for new date pipe

* Add info internationalization docs

* Fix lining

* Fix linting

* Fix date pipe unit test

* [ADF-4342] Add supported language files

* Fix e2e tests

lib/core/pipes/localized-date.pipe.ts

@@ -0,0 +1,50 @@
+/*!
+ * @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 { DatePipe } from '@angular/common';
+import { Pipe, PipeTransform } from '@angular/core';
+import { AppConfigService } from '../app-config/app-config.service';
+import { UserPreferencesService, UserPreferenceValues } from '../services/user-preferences.service';
+
+@Pipe({
+    name: 'adfLocalizedDate',
+    pure: false
+})
+export class LocalizedDatePipe implements PipeTransform {
+
+    static DEFAULT_LOCALE = 'en-US';
+    static DEFAULT_DATE_TIME_FORMAT = 'medium';
+
+    defaultLocale: string;
+    defaultFormat: string;
+
+    constructor(public userPreferenceService: UserPreferencesService,
+                public appConfig: AppConfigService) {
+        this.userPreferenceService.select(UserPreferenceValues.Locale).subscribe((locale) => {
+            this.defaultLocale = locale || LocalizedDatePipe.DEFAULT_LOCALE;
+        });
+        this.defaultFormat = this.appConfig.get<string>('dateValues.defaultFormat', LocalizedDatePipe.DEFAULT_DATE_TIME_FORMAT);
+    }
+
+    transform(value: any, format?: string, locale?: string): any {
+        const actualFormat = format || this.defaultFormat;
+        const actualLocale = locale || this.defaultLocale;
+        const datePipe: DatePipe = new DatePipe(actualLocale);
+        return datePipe.transform(value, actualFormat);
+    }
+
+}