Simple extbase extension to showcase translation handling problem
Install extension add demo.sql to your database
add plugin to your demo-page and translate the page.
Open the frontend in the secondary language secondary language try to edit a record and you'll see the id of the sector in the dropdown with uid_uidtranslated saving the record does not work
Does not work with records of sys_language_uid -1 or sys_language_uid 1 or translations of a sys_language_uid=0 record