Ah auto-generated captions.pic.twitter.com/LLnP7ycMFU
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
I'm always surprised at something difficult it gets right and then just trips over it's own feet on something simple & clear.
True! In my case I can't really blame it because I was using a couple Portuguese words/names. Happily surprised at how often it got things right.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.