feat: migrate to new tsclass schema

ts_web/elements/pagefooter.ts

@@ -27,7 +27,7 @@ export class DePageFooter extends DeesElement {
   @property({
     type: Object,
   })
-  letterData: plugins.tsclass.business.ILetter;
+  letterData: plugins.tsclass.business.TLetter;
 
   @property({
     type: Object,
@@ -119,17 +119,20 @@ export class DePageFooter extends DeesElement {
           ${this.letterData.from.address.city}<br />
           ${this.letterData.from.address.country}
         </div>
-        <div>
-          <strong
-            >${plugins.shared.translation.translate(
-              this.documentSettings.languageCode,
-              "footer@@registration.label"
-            )}:</strong
-          ><br />
-          Amtsgericht Bremen<br />
-          <i>reg-#:</i> HRB 35230 HB<br />
-          <i>vat-id:</i> ${this.letterData.from.vatId}
-        </div>
+        ${this.letterData.from.registrationDetails
+          ? html` <div>
+              <strong
+                >${plugins.shared.translation.translate(
+                  this.documentSettings.languageCode,
+                  "footer@@registration.label"
+                )}:</strong
+              ><br />
+              ${this.letterData.from.registrationDetails.registrationName}<br />
+              <i>reg-#:</i> ${this.letterData.from.registrationDetails
+                .registrationId}<br />
+              <i>vat-id:</i> ${this.letterData.from.registrationDetails.vatId}
+            </div>`
+          : null}
         <div>
           <strong
             >${plugins.shared.translation.translate(