Add CKndigung entity and related resources

- Introduced CKndigung entity with metadata definitions including fields, links, indexes, and scopes.
- Added CKndigung controller for handling requests.
- Created internationalization files for CKndigung in multiple languages.
- Updated existing metadata and resource files to include CKndigung references.
- Enhanced global translations to support CKndigung terminology.

custom/Espo/Custom/Resources/i18n/en_US/Global.json

@@ -12,7 +12,8 @@
         "Contact": "Portalnutzer",
         "CCallQueues": "Call-Queue",
         "CBankverbindungen": "Bankverbindung",
-        "CMietinkasso": "Mietinkasso"
+        "CMietinkasso": "Mietinkasso",
+        "CKndigung": "Kündigung"
     },
     "scopeNamesPlural": {
         "CVmhMietverhltnis": "Mietverhältnisse",
@@ -27,6 +28,7 @@
         "Contact": "Portalnutzer",
         "CCallQueues": "Call-Queues",
         "CBankverbindungen": "Bankverbindungen",
-        "CMietinkasso": "Mietinkassa"
+        "CMietinkasso": "Mietinkassa",
+        "CKndigung": "Kündigungen"
     }
 }