[BUGFIX] Disable edit of file metadata without translation

This avoids an error in case file metadata is edited through a file
reference and there is no file metadata translation for the current
language.

Resolves: #76262
Resolves: #82178
Releases: master, 8.7
Change-Id: Ifecf659637773c5f3773fc3439b09df9c030cb3f
Reviewed-on: https://review.typo3.org/54778


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Susanne Moog <susanne.moog@typo3.org>
Tested-by: Susanne Moog <susanne.moog@typo3.org>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>