[TASK] Use attribute translate="no" for non translatable strings

If a string is used in a XLIFF file but it should not be translated,
it must be identified as such. The XLIFF standard provides the attribute
"translate", see
http://docs.oasis-open.org/xliff/v1.2/os/xliff-core.html#translate.

The big advantage is that translators on Crowdin don't even see those labels anymore.

Resolves: #89318
Releases: master, 9.5
Change-Id: Ibe26d3524254ce0ef8404a96e412c2b15d0978be
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/61867


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Tested-by: Susanne Moog <look@susi.dev>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Susanne Moog <look@susi.dev>