toolbar.component.html

<mat-toolbar>
  <button mat-raised-button (click)="load()">
    {{'loadUnit' | translate}}
    <mat-icon>file_upload</mat-icon>
  </button>
  <button mat-raised-button (click)="save()">
    {{'saveUnit' | translate}}
    <mat-icon>file_download</mat-icon>
  </button>
</mat-toolbar>