i18n.php

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<?php
$result = elgg_view_field([
    '#type' => 'select',
    'name' => 'language',
    '#label' => elgg_echo('installation:language'),
    'value' => elgg_get_config('language'),
    'options_values' => elgg()->translator->getInstalledTranslations(true),
]);

$language_options = elgg()->translator->getInstalledTranslations();

// lock site language and English, these can't be disabled
$config_language = elgg_get_config('language');
if ($config_language !== 'en') {
    $language_options[$config_language] = [
        'text' => $language_options[$config_language],
        'value' => $config_language,
        'disabled' => true,
    ];
}

$language_options['en'] = [
    'text' => $language_options['en'],
    'value' => 'en',
    'disabled' => true,
];

$result .= elgg_view_field([
    '#type' => 'checkboxes',
    '#label' => elgg_echo('config:i18n:allowed_languages'),
    '#help' => elgg_echo('config:i18n:allowed_languages:help'),
    'name' => 'allowed_languages',
    'value' => elgg()->translator->getAllowedLanguages(),
    'options_values' => $language_options,
    'align' => 'horizontal',
]);

$result .= elgg_view_field([
    '#type' => 'select',
    '#label' => elgg_echo('config:i18n:who_can_change_language'),
    'name' => 'who_can_change_language',
    'value' => elgg_get_config('who_can_change_language'),
    'options_values' => [
        'everyone' => elgg_echo('config:i18n:who_can_change_language:everyone'),
        'admin_only' => elgg_echo('config:i18n:who_can_change_language:admin_only'),
        'nobody' => elgg_echo('config:i18n:who_can_change_language:nobody'),
    ],
]);

echo elgg_view_module('info', elgg_echo('admin:settings:i18n'), $result);