[ADF-2699] added localisation for time ago pipe (#3298)

* [ADF-2699] added localisation to the time-ago pipe

* [ADF-2699] added lang to time ago pipe

* [ADF-2699] added localisation for time ago pipe

* [ADF-2699] removed fdescribe

* [ADF-2699] removed comments

* [ADF-2699] removed useless default values

lib/core/pipes/time-ago.pipe.spec.ts

@@ -16,14 +16,15 @@
  */
 
 import { TimeAgoPipe } from './time-ago.pipe';
+import { async } from '@angular/core/testing';
 
 describe('TimeAgoPipe', () => {
 
     let pipe: TimeAgoPipe;
 
-    beforeEach(() => {
+    beforeEach(async(() => {
         pipe = new TimeAgoPipe();
-    });
+    }));
 
     it('should return time difference for a given date', () => {
         let date = new Date();
@@ -39,4 +40,13 @@ describe('TimeAgoPipe', () => {
         expect(pipe.transform(null)).toBe('');
         expect(pipe.transform(undefined)).toBe('');
     });
+
+    describe('When a locale is given', () => {
+
+        it('should return a localised message', async(() => {
+            let date = new Date();
+            const transformedDate  = pipe.transform(date, 'de');
+            expect(transformedDate).toBe('vor ein paar Sekunden');
+        }));
+    });
 });

lib/core/pipes/time-ago.pipe.ts

@@ -16,7 +16,6 @@
  */
 
 import moment from 'moment-es6';
-
 import { Pipe, PipeTransform } from '@angular/core';
 
 @Pipe({
@@ -24,11 +23,14 @@ import { Pipe, PipeTransform } from '@angular/core';
 })
 export class TimeAgoPipe implements PipeTransform {
 
-    transform(value: Date) {
+    defaultLocale = 'en-US';
+
+    transform(value: Date, locale?: string) {
         if (value !== null && value !== undefined ) {
+            const actualLocale = locale ? locale : this.defaultLocale;
             const then = moment(value);
-            const diff = moment().diff(then, 'days');
-            return diff > 7 ? then.format('DD/MM/YYYY HH:mm') : then.fromNow();
+            const diff = moment().locale(actualLocale).diff(then, 'days');
+            return diff > 7 ? then.locale(actualLocale).format('DD/MM/YYYY HH:mm') : then.locale(actualLocale).fromNow();
         }
         return '';
     }