Add CMietinkasso entity and localization support

- Introduced a new entity "CMietinkasso" with its metadata definitions, including fields, links, and indexes.
- Added controller for CMietinkasso to handle business logic.
- Created localization files for CMietinkasso in multiple languages (e.g., English, German, Spanish, etc.) to support internationalization.
- Updated global JSON files to include references to the new entity.
- Modified configuration files to integrate CMietinkasso into the application structure.

custom/Espo/Custom/Controllers/CMietinkasso.php

@@ -0,0 +1,7 @@
+<?php
+
+namespace Espo\Custom\Controllers;
+
+class CMietinkasso extends \Espo\Core\Templates\Controllers\BasePlus
+{
+}