title: Angular Owl Date Time Picker Labels and Buttons not localized
body: <p>In the Owl Date Time Picker, the From and To labels, as well as Set and Cancel buttons are not localized. My code for specifying the locale is:</p>
  
  <pre><code>constructor(
    private dateTimeAdapter: DateTimeAdapter&lt;any&gt;
  ) {
      dateTimeAdapter.setLocale(localStorage.getItem('localeId'));
  }
  </code></pre>
  
  <p>Tried with de, fr, zh</p>
  
  <p><a href="https://i.stack.imgur.com/ffCTC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ffCTC.png" alt="enter image description here"></a></p>
  
  <p>"ng-pick-datetime": "^7.0.0"</p>
  
  <p>What could be the issue?</p>
  
  <p>Edit:</p>
  
  <p>To test, I tried:</p>
  
  <pre><code>import { BrowserModule } from '@angular/platform-browser';
  import { NgModule } from '@angular/core';
  import { AppRoutingModule } from './app-routing.module';
  import { AppComponent } from './app.component';
  import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
  import { SampleTableComponent } from './sample-table/sample-table.component';
  import { MaterialModule } from './material.module';
  import { MatFormComponent } from './mat-form/mat-form.component';
  import { FormsModule, ReactiveFormsModule } from '@angular/forms';
  import { OwlDateTimeModule, OwlNativeDateTimeModule, OwlDateTimeIntl } from 'ng-pick-datetime';
  
  export class DefaultIntl extends OwlDateTimeIntl {
    cancelBtnLabel: 'C';
    setBtnLabel: 'S';
    rangeFromLabel: 'F';
    rangeToLabel: 'T';
  }
  
  @NgModule({
    declarations: [
      AppComponent,
      SampleTableComponent,
      MatFormComponent
    ],
    imports: [
      BrowserModule,
      AppRoutingModule,
      FormsModule,
      ReactiveFormsModule,
      BrowserAnimationsModule,
      MaterialModule,
      OwlDateTimeModule,
      OwlNativeDateTimeModule,
    ],
    providers: [{provide: OwlDateTimeIntl, useClass: DefaultIntl}],
    bootstrap: [AppComponent]
  })
  export class AppModule { }
  </code></pre>
  
  <p>But I'm still seeing From, To, Set, Cancel</p>