As of Gamma 2.0 there is now no way to automatically grab the current system name. MB did warn us that it was being removed, so I'm not surprised. This does however make the automatic logging of your travels not possible at the moment. As a work around on the Diary Entry tab you can use an Entry Type of Starsystem, and then manually enter your location. The route planning part of the app is now a little superfluous because there is a route planner built into ED. However I'll leave it in for now, at least until FD make known what they plan to do for an API.
I have a couple of other minor updates to put in, so expect an update later this evening (UK time).