Elgg\I18n\Translator::registerTranslations PHP Method

    public function registerTranslations($path, $load_all = false, $language = null)
    {
        $path = sanitise_filepath($path);
        // Make a note of this path just incase we need to register this language later
        if (!isset($GLOBALS['_ELGG']->language_paths)) {
            $GLOBALS['_ELGG']->language_paths = array();
        }
        $GLOBALS['_ELGG']->language_paths[$path] = true;
        _elgg_services()->logger->info("Translations loaded from: {$path}");
        if ($language) {
            $load_language_files = array("{$language}.php");
            $load_all = false;
        } else {
            // Get the current language based on site defaults and user preference
            $current_language = $this->getCurrentLanguage();
            $load_language_files = array('en.php', "{$current_language}.php");
            $load_language_files = array_unique($load_language_files);
        }
        $handle = opendir($path);
        if (!$handle) {
            _elgg_services()->logger->error("Could not open language path: {$path}");
            return false;
        }
        $return = true;
        while (false !== ($language_file = readdir($handle))) {
            // ignore bad files
            if (substr($language_file, 0, 1) == '.' || substr($language_file, -4) !== '.php') {
                continue;
            }
            if (in_array($language_file, $load_language_files) || $load_all) {
                $result = (include_once $path . $language_file);
                if ($result === false) {
                    $return = false;
                    continue;
                } elseif (is_array($result)) {
                    $this->addTranslation(basename($language_file, '.php'), $result);
                }
            }
        }
        return $return;
    }