Add CKndigung entity and related resources

- Created CKndigung controller extending BasePlus.
- Added internationalization support for CKndigung in multiple languages (ar_AR, bg_BG, cs_CZ, da_DK, de_DE, en_GB, en_US, es_ES, es_MX, fa_IR, fr_FR, hr_HR, hu_HU, id_ID, it_IT, ja_JP, lt_LT, lv_LV, nb_NO, nl_NL, pl_PL, pt_BR, pt_PT, ro_RO, ru_RU, sk_SK, sl_SI, sr_RS, sv_SE, th_TH, tr_TR, uk_UA, vi_VN, zh_CN, zh_TW).
- Defined CKndigung metadata including entity definitions, record definitions, and scopes.
- Updated global configuration to include CKndigung in relevant lists.

custom/Espo/Custom/Resources/i18n/zh_CN/CKndigung.json

@@ -0,0 +1,10 @@
+{
+  "links": {
+    "meetings": "会晤",
+    "calls": "通话",
+    "tasks": "任务"
+  },
+  "labels": {
+    "Create CKndigung": "创建 Kündigung"
+  }
+}