Resolve "Delete account"

Closes #392 (closed)

src/app/components/shared/_dialogs/delete-account/delete-account.component.html

+<h3>{{ 'header.sure' | translate }}</h3>
+<mat-divider></mat-divider>
+<p>{{ 'header.really-delete-account' | translate }}</p>
+<div fxLayout="row" fxLayoutAlign="center" fxLayoutGap="10px">
+  <button mat-raised-button class="abort" (click)="close('abort')">
+    {{ 'header.abort' | translate }}
+  </button>
+  <button mat-raised-button class="delete" (click)="close('delete')">
+    {{ 'header.delete' | translate }}
+  </button>
+</div>