A new feature of #twitter on phones. Night mode.pic.twitter.com/qZhEE74hcC
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 one of your tweeps and I have a galaxy and I have had this feature for a while.
maybe it released in UK first and coming to Germany now.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.