Feature: #92337 - Allow translatable labels for bookmark groups

See forge#92337


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.


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


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