[!!!][FEATURE] Respect attribute "approved" when parsing XLIFF files

By supporting the `approved` attribute, integrators can decide
whether translations not marked as approved should be used. This
attribute is particularly useful when working with third-party
software and translation agencies. Allowing unapproved translations
may increase the number of translations, possibly at the expense of
their quality.

Resolves: #97729
Releases: main
Change-Id: Iafe53565f618722050a9efbd0132473b866ddd13
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74811


Tested-by: Benni Mack <benni@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>