Provide each mat-slide-toggle in the app with state-specific labels
As done for toggling the mode of creating a room key.
<mat-slide-toggle
(change)="hasCustomShortId=$event.checked">
<span *ngIf="hasCustomShortId">{{ 'home-page.custom-shortid' | translate }}</span>
<span *ngIf="!hasCustomShortId">{{ 'home-page.generated-shortid' | translate }}</span>
</mat-slide-toggle>