title: translateService.onLangChange.subscribe does not trigger when lang changes in OnInit
body: <p>So I had translateService.onLangChange.subscribe in a component where it worked fine but a made a separate service were it would subscribe to langChange and set a localeDate for me. But when I change the lang it doesnt register it and does nothing.</p>
  <pre><code>ngOnInit(): void {
      this.getLocaleDateFormat();
      this.translateService.onLangChange.subscribe(() =&gt; this.getLocaleDateFormat());
    }
  getLocaleDateFormat() {
      // To add another lang it has to be added to Languages bellow to match the locale_id of the lang and in main module it has to be imported and registered
      this.dateAdapter.setLocale(Languages[this.translateService.currentLang]);
      this.currLang = Languages[this.translateService.currentLang];
      console.log('locale-date-adapters currLang: ' + this.currLang);
      return this.currLang;
    }
  </code></pre>
  <p>also everytime the lang change I'd like my component to get that value from getLocaleDateFormat(), without having</p>
  <pre><code>this.translateService.onLangChange.subscribe(() =&gt; thisLocaleDateAdapterService.getLocaleDateFormat()); 
  </code></pre>
  <p>in my component. I tried subscribing to it but got an error that it isn't a function.</p>
  <p>this is what I tried:</p>
  <pre><code>this.localeDateAdapterService.getLocaleDateFormat().subscribe(currLang =&gt; this.currLang = currLang);
  </code></pre>
  <p>I basically want it to be listening to getLocaleDateFormat and change the value when it changes.</p>
  <p>UPDATE:
  I just realized that the problem is in the OnInit thats not trigering the lang change. LangChange is trigger inside the service in function but not in OnInit</p>