Examples

Simple language field

EXT:styleguide/Configuration/TCA/tx_styleguide_elements_basic.php
'columns' => [
    'sys_language_uid' => [
        'exclude' => true,
        'label' => 'LLL:EXT:core/Resources/Private/Language/locallang_general.xlf:LGL.language',
        'config' => [
            'type' => 'language',
        ],
    ],
]