[TASK] Provide correct data for DatabaseLanguageRowsTest

The dummy data provided in DatabaseLanguageRowsTest
leads to some E_NOTICEs.

This patch aims to provide the minimal correct set of dummy
data needed to run the affected tests without any E_NOTICE

Resolves: #71236
Related: #70584
Releases: master
Change-Id: I159f71325bdd26482ac1bdfb8176ff707acbc036
Reviewed-on: https://review.typo3.org/44470


Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>