Feature: #90114 - Make translation of filelist optional

See Issue #90114

Description

The filelist module now takes $GLOBALS['TCA']['sys_file_metadata']['ctrl']['languageField'] into account. By unsetting the field, translations in the filelist module are no longer possible.

Impact

If $GLOBALS['TCA']['sys_file_metadata']['ctrl']['languageField'] is set to an empty value, translations are disabled for the filelist module.