Flarum\Locale\Translator::parseCatalogue PHP Method

    private function parseCatalogue(MessageCatalogueInterface $catalogue)
    {
        foreach ($catalogue->all() as $domain => $messages) {
            foreach ($messages as $id => $translation) {
                if (preg_match(self::REFERENCE_REGEX, $translation, $matches)) {
                    $catalogue->set($id, $this->getTranslation($catalogue, $id, $domain), $domain);
                }
            }
        }
    }