Problem changing the interface text to spanish

[RoWEN-FCUB]

Hello. I changed the texts of the interface in a custom class, however the component shows them in English some times. In my app.module.ts: import { OwlDateTimeModule, OwlNativeDateTimeModule, OWL_DATE_TIME_LOCALE, OwlDateTimeIntl } from 'ng-pick-datetime';

export class DefaultIntl extends OwlDateTimeIntl {
  /** A label for the up second button (used by screen readers).  */
  upSecondLabel = 'Añadir un segundo';

  /** A label for the down second button (used by screen readers).  */
  downSecondLabel = 'Disminuir un segundo';

  /** A label for the up minute button (used by screen readers).  */
  upMinuteLabel = 'Añadir un minuto';

  /** A label for the down minute button (used by screen readers).  */
  downMinuteLabel = 'Disminuir un minuto';

  /** A label for the up hour button (used by screen readers).  */
  upHourLabel = 'Añadir una hora';

  /** A label for the down hour button (used by screen readers).  */
  downHourLabel = 'Disminuir una hora';

  /** A label for the previous month button (used by screen readers). */
  prevMonthLabel = 'Mes anterior';

  /** A label for the next month button (used by screen readers). */
  nextMonthLabel = 'Mes siguiente';

  /** A label for the previous year button (used by screen readers). */
  prevYearLabel = 'Año anterior';

  /** A label for the next year button (used by screen readers). */
  nextYearLabel = 'Siguiente año';

  /** A label for the previous multi-year button (used by screen readers). */
  prevMultiYearLabel = 'Anteriores 21 años';

  /** A label for the next multi-year button (used by screen readers). */
  nextMultiYearLabel = 'Siguientes 21 años';

  /** A label for the 'switch to month view' button (used by screen readers). */
  switchToMonthViewLabel = 'Cambiar a vista de meses';

  /** A label for the 'switch to year view' button (used by screen readers). */
  switchToMultiYearViewLabel = 'Seleccionar mes y año';

  /** A label for the cancel button */
  cancelBtnLabel = 'Cancelar';

  /** A label for the set button */
  setBtnLabel = 'Aceptar';

  /** A label for the range 'from' in picker info */
  rangeFromLabel = 'Desde';

  /** A label for the range 'to' in picker info */
  rangeToLabel = 'Hasta';

  /** A label for the hour12 button (AM) */
  hour12AMLabel = 'AM';

  /** A label for the hour12 button (PM) */
  hour12PMLabel = 'PM';
}

providers: [
    {provide: OWL_DATE_TIME_LOCALE, useValue: 'es'},
    {provide: OwlDateTimeIntl, useClass: DefaultIntl},    
  ],

In this component shows the text of the labels and buttons in Spanish:

<input [owlDateTime]="dh" [selectMode]="'range'" [owlDateTimeTrigger]="dh" nbInput status="info" class="form-control" [(ngModel)]="hora">
<owl-date-time #dh [pickerType]="'timer'"></owl-date-time>

And in this other component keeps showing the texts in English:

<input type="text" style="visibility: hidden" [owlDateTime]="dt" (dateTimeChange)="posponer($event)">
<owl-date-time #dt></owl-date-time>
<nb-icon *ngIf="task.estado==='Pendiente' || user.role==='admin'" (click)="clickposponer(i)" [owlDateTimeTrigger]="dt" icon="clock-outline" [options]="{animation:{type: 'zoom'}}" nbTooltip="Posponer tarea" nbTooltipIcon="clock-outline" nbTooltipStatus="info"></nb-icon>