How do I find out my fluency
The fluency metric is only available for the 5 original courses. To be honest there is so much negative comments about it that this limitation is really not a major problem.
Well, it shows up on Swedish for me, too, but as Pete says, it's complete crap. You find out your fluency by taking a recognized test from a language institute (Goethe, say, for German), not from a figure based on pixie dust and wishes that Duolingo created.
Burner0 on the Android app second trophy from the last is gain 10%fluency and the last is complete a language course at least on my app it is those are the only trophies I don't have
Some users on Android seem to have it appearing though, so perhaps there are some developments here
Remember you can take the test which give a sense of relative understanding if you do it more than once, although I found using it for learning Irish to be quite demotivating as there is no feed back except the raw score.