title: using ng2-translate with jhipster, Property 'parser' is private in type 'TranslateService' but not in type 'TranslateService'
body: <p>i'm using angular-cli as a client for Jhipster, and when i try to build my project i have a probleme on Translate module, i tried to upgrade to ngx-translate but i still having the same problem.</p>
  
  <p>here is the error i got : </p>
  
  <p>'TranslateService' is not assignable to parameter of type 'TranslateService'.</p>
  
  <p>shared-common.module.ts : </p>
  
  <pre><code>    import { NgModule, Sanitizer } from '@angular/core';
  import { Title } from '@angular/platform-browser';
  import { TranslateService } from 'ng2-translate';
  import { AlertService } from 'ng-jhipster';
  import {
      CarcheckappSharedLibsModule,
      JhiLanguageHelper,
      FindLanguageFromKeyPipe,
      JhiAlertComponent,
      JhiAlertErrorComponent
  } from './';
  
  export function alertServiceProvider(sanitizer: Sanitizer,
                                       translateService: TranslateService) {
      // set below to true to make alerts look like toast
      const isToast = false;
      return new AlertService(sanitizer, isToast, translateService);
  }
  
  @NgModule({
      imports: [
          CarcheckappSharedLibsModule
      ],
      declarations: [
          FindLanguageFromKeyPipe,
          JhiAlertComponent,
          JhiAlertErrorComponent
      ],
      providers: [
          JhiLanguageHelper,
          {
              provide: AlertService,
              useFactory: alertServiceProvider,
              deps: [Sanitizer, TranslateService]
          },
          Title
      ],
      exports: [
          CarcheckappSharedLibsModule,
          FindLanguageFromKeyPipe,
          JhiAlertComponent,
          JhiAlertErrorComponent
      ]
  })
  export class CarcheckappSharedCommonModule {}
  </code></pre>