diff --git a/lib/core/mock/traslation.service.mock.ts b/lib/core/mock/traslation.service.mock.ts
index cb86c632b9..68e36cceb9 100644
--- a/lib/core/mock/traslation.service.mock.ts
+++ b/lib/core/mock/traslation.service.mock.ts
@@ -25,13 +25,17 @@ export interface LangChangeEvent {
 
 export class TranslationMock {
 
-    public onLangChange: EventEmitter<LangChangeEvent> = new EventEmitter<LangChangeEvent>();
+    onLangChange: EventEmitter<LangChangeEvent> = new EventEmitter<LangChangeEvent>();
 
     addTranslationFolder() {
 
     }
 
-    public get(key: string|Array<string>, interpolateParams?: Object): Observable<string|any> {
+    get(key: string|Array<string>, interpolateParams?: Object): Observable<string|any> {
         return Observable.of(key);
     }
+
+    instant(key: string | Array<string>, interpolateParams?: Object): string | any {
+        return key;
+    }
 }
diff --git a/lib/core/pipes/file-size.pipe.ts b/lib/core/pipes/file-size.pipe.ts
index 9a8d52a285..12cb6f1b9e 100644
--- a/lib/core/pipes/file-size.pipe.ts
+++ b/lib/core/pipes/file-size.pipe.ts
@@ -33,7 +33,7 @@ export class FileSizePipe implements PipeTransform {
         }
 
         if (bytes === 0) {
-            return '0 Bytes';
+            return '0 ' + this.translation.instant('CORE.FILE_SIZE.BYTES');
         }
 
         const k = 1024,