ext_tables.php

<?php
if (!defined('TYPO3_MODE')) {
    throw new \Exception('Access denied.');
}

call_user_func(
    function ($extensionKey) {
        if (TYPO3_MODE === 'BE') {
            // Registering module.
            \TYPO3\CMS\Extbase\Utility\ExtensionUtility::registerModule(
                'Romm.' . $extensionKey,
                'tools',
                'Administration',
                '',
                [
                    'Administration' => 'index,new,submit,processCopy,help',
                    'Duplication'    => 'ajaxProcessDuplication',
                    'Ajax'           => 'dispatch'
                ],
                [
                    'access' => 'user,group',
                    'icon'   => 'EXT:' . $extensionKey . '/ext_icon.png',
                    'labels' => 'LLL:EXT:' . $extensionKey . '/Resources/Private/Language/locallang_sitefactory.xlf',
                ]
            );
        }

        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($extensionKey, 'Configuration/TypoScript/Default', 'Site Factory - Default settings');
        \TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addStaticFile($extensionKey, 'Configuration/TypoScript/FieldsExample', 'Site Factory - Fields example');

        // Extending locallang files.
        $GLOBALS['TYPO3_CONF_VARS']['SYS']['locallangXMLOverride']['EXT:' . $extensionKey . '/Resources/Private/Language/locallang.xlf'] = [
            'EXT:' . $extensionKey . '/Resources/Private/Language/FineUploader.xlf',
            'EXT:' . $extensionKey . '/Resources/Private/Language/FieldsLocallang.xlf'
        ];
    },
    $_EXTKEY
);