code: func (d *localeStore) Get(lang, section, format string) (string, bool) {
  	if locale, ok := d.store[lang]; ok {
  		if key, err := locale.message.Section(section).GetKey(format); err == nil {
  			return key.Value(), true
  		}
  	}
  
  	if len(d.defaultLang) > 0 && lang != d.defaultLang {
  		return d.Get(d.defaultLang, section, format)
  	}
  
  	return "", false
  }
docs: // Get target language string