Table "sys_language" is deprecated since TYPO3 v11

[magicsunday]

Installing your exension in a TYPO3 v12 results in the error while accesing the backend module:

An exception occurred while executing a query: Table 'typo3.sys_language' doesn't exist

as there is no table "sys_language" anymore.

See:

https://github.com/in2code-de/in2studyfinder/blob/master/Classes/Controller/BackendController.php#L130

Reference:
https://docs.typo3.org/c/typo3/cms-core/main/en-us/Changelog/11.3/Deprecation-94165-SysLanguageDatabaseTable.html