message: fix(ionic4): transaction-detail page
diff: <signed-transaction [unsignedTx]="deserializedSync"></signed-transaction>
  <ion-fab vertical="bottom" horizontal="end" slot="fixed">
  - <ion-button color="primary" shape="round" slot="start" (click)="signAndGoToNextPage()">
  + <ion-button color="primary" shape="round" (click)="signAndGoToNextPage()">
  <ion-icon md-name="check"></ion-icon>
  {{ 'transaction-detail.sign-tx_label' | translate }}
  </ion-button>
  