languages.js.php

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<?php
$language = elgg_extract('language', $vars, 'en');

// requested language
$combine_languages = [];
$combine_languages[$language] = true;

// add site language
$site_language = elgg_get_config('language');
if (!empty($site_language)) {
    $combine_languages[$site_language] = true;
}

// add English fallback
$combine_languages['en'] = true;

// fetch all translations
$all_translations = _elgg_services()->translator->getLoadedTranslations();

// make sure all requested languages are loaded
foreach (array_keys($combine_languages) as $language) {
    if (!isset($all_translations[$language])) {
        _elgg_services()->translator->reloadAllTranslations();
        
        $all_translations = _elgg_services()->translator->getLoadedTranslations();
        break;
    }
}

// combine all languages in one result
$translations = [];
foreach (array_keys($combine_languages) as $language) {
    if (!isset($all_translations[$language])) {
        continue;
    }
    
    $translations = array_merge($all_translations[$language], $translations);
}

echo json_encode($translations, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES);