SwiftKey knows me well apparently.
pic.twitter.com/G8tiFyVx1v
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
Swiping it left or right makes it change language. What's the difference in your apps? I'm on android.
I added Ελληνικά and got the swipe on the space bar. But only 2 options, en/fr and Ελληνικά.

Oh. That's awful. I don't understand why this makes sense. 
I think mine used to, but it disappeared long ago. See the 2 English suggestions, 1 French? Quite often I get all French, well into an all English text. Makes the predictions useless. Android.pic.twitter.com/I9K930PHC7
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.