app,module.ts

// imports and your loader...

@NgModule({
  declarations: [AppComponent],
  entryComponents: [],
  imports: [
    BrowserModule,
    IonicModule.forRoot(),
    AppRoutingModule,
    HttpClientModule, // <--- add this
    TranslateModule.forRoot({ // <--- add this
      loader: { // <--- add this 
        provide: TranslateLoader, // <--- add this
        useFactory: (createTranslateLoader),  // <--- add this
        deps: [HttpClient] // <--- add this
      } // <--- add this
    }) // <--- add this
  ],
  providers: [
    StatusBar,
    SplashScreen,
    { provide: RouteReuseStrategy, useClass: IonicRouteStrategy }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }