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/vi_VN/CKndigung.json

@@ -0,0 +1,10 @@
+{
+  "links": {
+    "meetings": "Cuộc hẹn",
+    "calls": "Cuộc gọi",
+    "tasks": "Nhiệm vụ"
+  },
+  "labels": {
+    "Create CKndigung": "Tạo Kündigung"
+  }
+}