added a MockTranslateLoader to fix 404 with ng2-translate during testing

src/app/shared/testing/mock-translate-loader.ts

@@ -0,0 +1,8 @@
+import { TranslateLoader } from "ng2-translate";
+import { Observable } from "rxjs";
+
+export class MockTranslateLoader implements TranslateLoader {
+  getTranslation(lang: string): Observable<any> {
+    return Observable.of({});
+  }
+}