[TASK] Fix deprecated code calling LanguageService::sL()

Calling LanguageService::sL() with true for 2nd argument is deprecated.
Use htmlspecialchars() directly.

Resolves: #77653
Releases: master
Change-Id: Id0d4490747ac94b861f42adfb1acafc63ebf5f07
Reviewed-on: https://review.typo3.org/49611


Tested-by: Bamboo TYPO3com <info@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <typo3@scripting-base.de>
Tested-by: Andreas Fernandez <typo3@scripting-base.de>