Normally I use a nightly build version from Osmand that I download and install manually every two weeks or similar.
And when switching the Osmand app language fro German to English, I go to "Global app settings", sub-area Localization, and there I can see four items:
Display language
Driving Region
Map preferred language
Unit of measure
I have no old version from summer 2015 to compare with the official release from June 2015,
but I hope (like many other users I assume, that we will have a new official Osmand release in some weeks.
Having the github code repository activity in view, there have been really many changes about app user interface.
Stephan