feat(Navigation, UserRights, Localization): add worker schedules feature and enhance access control

- Updated navigation structure to include a new section for worker schedules, accessible to specific user roles.
- Introduced a new user right type for 'worker_schedule_read' to manage access permissions effectively.
- Added localization entries for worker schedules in multiple languages, ensuring consistent user experience across the application.
- Created a new route and component for managing worker schedules in the admin panel.

backend/sql/add_worker_schedule_read_right.sql

@@ -0,0 +1,9 @@
+-- Adds user right required for Falukant worker schedule read access.
+
+INSERT INTO "type".user_right (title)
+SELECT 'worker_schedule_read'
+WHERE NOT EXISTS (
+  SELECT 1
+  FROM "type".user_right
+  WHERE title = 'worker_schedule_read'
+);