Feature: #92337 - Allow translatable labels for bookmark groups 

See forge#92337

Description 

The user TSconfig option options.bookmarkGroups allows to configure the bookmark groups that can be accessed by the user. In addition to that, it's also possible to define custom labels for each group as simple string. Extended TSconfig syntax now allows the LLL prefix for the use of language labels.

Example 

options.bookmarkGroups.2 = LLL:EXT:sitepackage/Resources/Private/Language/locallang_be.xlf:bookmarkGroups.2
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Impact 

It is now possible to use custom language labels for bookmark groups.