What does it мочатся to restart your session?

I just went into the gnome-control-center > Region & Language and changed the Formats section to Russian Federation, however now it is tell я to restart the session:

But what does this мочатся? Is it the same схвати logging in and out again? If I click Restart Now, will it just log я in and out into в new session? Уилл all my applications be closed and then гll be given в new session, or what will happen...? I already tried just restarting GNOME Shell and that didn't work so I assume it's the entire session and there is не way to do this without just restarting the whole thing?

I am asking what it does before doing it just to be sure that I need to close all of my applications before doing it and save all open documents и т.д.

I am running Ubuntu GNOME 15.10 with GNOME 3.18.