return (
  <LangContext.Provider value={{
    lang,
    switchLang,
    currentLangData: langData[lang] // English === langData['en-US']
  }}>
    {props.children}
  </LangContext.Provider>
);
const langData = {
  'en-US': { /* titles in English ... */ },
  'es-ES': { /* Spanish */ },
  'ru-RU': { /* Russian */ },