Feature Flag Implementation Phonebook

settings.component.html

        <div *ngIf=""> <!-- TODO: Check-if there are featureFlags -> add a function in .component.ts -->
            <h2>
                <mat-icon>flag</mat-icon>
                <span i18n="SettingsComponent|Feature Flag Subtitle@@SettingsComponentSubTitleFeatureFlag">
                    Feature Flags
                </span>
            </h2>
            <mat-list>
                <mat-list-item *ngFor="let flag of (featureFlags | async)">
                    <mat-slide-toggle [checked]="flag.value" color="primary"
                        (change)="changeFeatureFlag($event, flag.name)">
                        {{flag.name}}
                    </mat-slide-toggle>
                </mat-list-item>
            </mat-list>
        </div>