[CLEANUP] EXT:recordlist

- Remove duplicated code
- Remove 2nd argument to call of LanguageService::sL
- Smaller nitpicks

Releases: master
Resolves: #81028
Change-Id: I3fc7ad0e1f9d687f96a780123dc82ec02397c458
Reviewed-on: https://review.typo3.org/52624


Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Henrik Elsner <helsner@dfau.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>