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.

data/config.php

@@ -360,8 +360,8 @@ return [
     0 => 'youtube.com',
     1 => 'google.com'
   ],
-  'cacheTimestamp' => 1769256001,
-  'microtime' => 1769256001.008295,
+  'cacheTimestamp' => 1769331937,
+  'microtime' => 1769331937.84435,
   'siteUrl' => 'https://crm.bitbylaw.com',
   'fullTextSearchMinLength' => 4,
   'appTimestamp' => 1768843902,