public function loadJsTranslation($langcode = null)
    {
        $strings = $this->loadTranslation($this->getContextJsFile($langcode));

        $translations = array();
        foreach ($strings as $source => $translation) {
            if (isset($translation[0]) && $translation[0] !== '') {
                $translations[$source] = $translation;
            }
        }

        return $translations;
    }