user can change show type and date

src/app/modules/shows/edit/edit.component.html

@@ -0,0 +1,31 @@
+<div>
+  <app-card [closeLink]="'/shows/'+form.value.id" heading="Veranstaltung ändern">
+    <div [formGroup]="form" class="split">
+      <mat-form-field appearance="outline">
+        <mat-label>Art der Veranstaltung</mat-label>
+        <mat-select formControlName="showType">
+          <mat-optgroup label="öffentlich">
+            <mat-option *ngFor="let key of showTypePublic" [value]="key">{{
+              key | showType
+              }}</mat-option>
+          </mat-optgroup>
+          <mat-optgroup label="privat">
+            <mat-option *ngFor="let key of showTypePrivate" [value]="key">{{
+              key | showType
+              }}</mat-option>
+          </mat-optgroup>
+        </mat-select>
+      </mat-form-field>
+      <mat-form-field appearance="outline">
+        <mat-label>Datum</mat-label>
+        <input [matDatepicker]="picker" formControlName="date" matInput/>
+        <mat-datepicker-toggle [for]="picker" matSuffix></mat-datepicker-toggle>
+        <mat-datepicker #picker touchUi></mat-datepicker>
+      </mat-form-field>
+    </div>
+
+    <app-button-row>
+      <app-button (click)="onSave()" [icon]="faSave">Speichern</app-button>
+    </app-button-row>
+  </app-card>
+</div>