[TASK] Remove duplicate label for "Language"

Only the table "tt_content" overrides the label for the sys_language_uid
field on palette level with
"EXT:frontend/.../locallang_ttc.xlf:sys_language_uid_formlabel".
However, this label is exactly the same as
"EXT:core/.../locallang_general.xlf:LGL.language". Therefore, the first
mentioned label is removed in favour of the original one.

Note: The second label was probably introduced in 2010 when the original
field contained "Language:" (with colons at the end). This has been
removed in the meantime.

See commit: b6fb9732

Resolves: #100344
Releases: main
Change-Id: I8285cf95b9c0b9bd583bb6a6d63c9d29db7e3467
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78316


Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>