Add termination (Kündigung) functionality and related translations

- Implemented the ability to initiate terminations from Mietverhältnisse.
- Added new fields and options for terminations in both German and English language files.
- Updated metadata definitions to include relationships for terminations with Mietobjekte and Beteiligte.
- Enhanced the service layer to handle termination creation, including linking relevant entities and copying documents.
- Updated configuration timestamps for deployment.

custom/Espo/Custom/Resources/i18n/de_DE/Contact.json

@@ -14,6 +14,8 @@
     "cMietobjekteContactPortal": "Mietobjekte (Portal)",
     "cAdressenContact": "Adressen",
     "cVmhRumungsklageContact": "Räumungsklagen (Portal)",
+    "cMietinkassoContact": "Mietinkasso",
+    "cKuendigungContact": "Kündigungen",
     "cBankverbindungenContact": "Bankverbindungen"
   },
   "links": {
@@ -29,6 +31,7 @@
     "cAdressenContact": "Adressen",
     "cVmhRumungsklageContact": "Räumungsklagen (Portal)",
     "cMietinkassoContact": "Mietinkasso",
+    "cKuendigungContact": "Kündigungen",
     "cBankverbindungenContact": "Bankverbindungen"
   },
   "options": {