core/Configuration/TCA/Overrides/be_users.php

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<?php
defined('TYPO3_MODE') or die();

// Populate available languages
$locales = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(\TYPO3\CMS\Core\Localization\Locales::class);
$languageItems = $locales->getLanguages();
unset($languageItems['default']);
asort($languageItems);
foreach ($languageItems as $locale => $name) {
    $GLOBALS['TCA']['be_users']['columns']['lang']['config']['items'][] = array($name, $locale);
}