@let isFavorite = isFavorite$ | async;
@if (isFavorite === false) {
    <button mat-flat-button color="accent" (click)="addToFavorites()">
        <mat-icon>star_outline</mat-icon>
        {{ 'PORTALS.ADD_TO_FAVORITES' | translate }}
    </button>
} @else {
    <button mat-stroked-button color="accent" (click)="removeFromFavorites()">
        <mat-icon>star</mat-icon>
        {{ 'PORTALS.REMOVE_FROM_FAVORITES' | translate }}
    </button>
}