Refactor localization and remove CAIKnowledge entity

- Removed CAIKnowledge localization files for various languages (el_GR, 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, ur_IN, vi_VN, zh_CN, zh_TW).
- Deleted related layout and metadata files for CAIKnowledge.
- Removed references to CAIKnowledge in existing metadata definitions for CDokumente, CMietinkasso, and CVmhRumungsklage.
- Updated config and state files to reflect the removal of CAIKnowledge.
- Cleaned up unused localization keys in existing JSON files.

custom/Espo/Custom/Resources/metadata/entityDefs/CMietinkasso.json

@@ -84,9 +84,6 @@
         },
         "advowareAkten": {
             "type": "linkOne"
-        },
-        "aIKnowledge": {
-            "type": "linkOne"
         }
     },
     "links": {
@@ -201,12 +198,6 @@
             "foreign": "mietinkasso",
             "entity": "CAkten",
             "isCustom": true
-        },
-        "aIKnowledge": {
-            "type": "hasOne",
-            "foreign": "mietinkasso",
-            "entity": "CAIKnowledge",
-            "isCustom": true
         }
     },
     "collection": {