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/en_US/CDokumente.json

@@ -10,7 +10,9 @@
         "md5sum": "MD5 Checksum",
         "sha256": "SHA256 Checksum",
         "beteiligte2dokumente": "Parties",
-        "mietobjekt2dokumente": "Properties"
+        "mietobjekt2dokumente": "Properties",
+        "mietinkassosdokumente": "Rent Collection",
+        "kndigungensdokumente": "Terminations"
     },
     "links": {
         "contactsvmhdokumente": "Portal Users",
@@ -19,7 +21,8 @@
         "vmhRumungsklagesdokumente": "Eviction Lawsuits",
         "beteiligte2dokumente": "Parties",
         "mietobjekt2dokumente": "Properties",
-        "mietinkassosdokumente": "Rent Collection"
+        "mietinkassosdokumente": "Rent Collection",
+        "kndigungensdokumente": "Terminations"
     },
     "labels": {
         "Create CDokumente": "Create Dokument"