Breaking: #108800 - Remove translation files
Description
To unify the academic extensions the usage of locallang_ files was
removed and the labels were moved to the locallang_ files.
Impact
TYPO3 instances with extensions providing translation overrides or
using the locallang_ keys with the full syntax directly no
longer replaces or provide them or leading to untranslated key
display.
Affected installations
TYPO3 instances with extensions providing translation overrides or
using the locallang_ keys with the full syntax directly.
Migration
Use the keys from locallang_ files.
Important
Furthermore many label ids have changed to unify the naming in the academic extensions.