Add CAdvowareAkten entity and related metadata

- Introduced new entity CAdvowareAkten with fields: name, description, createdAt, modifiedAt, assignedUser, teams, vmhRumungsklage, mietinkasso, aktenzeichen, and aktennummer.
- Defined relationships for CAdvowareAkten with existing entities: CVmhRumungsklage and CMietinkasso.
- Created client definitions, layouts, and ACL for CAdvowareAkten.
- Added internationalization support for CAdvowareAkten in multiple languages.
- Updated existing entities and metadata to include references to CAdvowareAkten.

custom/Espo/Custom/Resources/metadata/clientDefs/CMietinkasso.json

@@ -39,5 +39,11 @@
             }
         ]
     },
-    "iconClass": "fas fa-money-bill-1-wave"
+    "iconClass": "fas fa-money-bill-1-wave",
+    "relationshipPanels": {
+        "advowareAkten": {
+            "layout": null,
+            "selectPrimaryFilterName": null
+        }
+    }
 }