I guess it could be, but personally, I think that there seems to be a slight difference.
You could be offline without being logged out. For example, someone could appear offline in a chat just because they closed the tab, not necessary logging out of the chat (as in the next time they opened the chat tab, they wouldn't have to write username and password all over again, they would already be logged in, and online.)
That might be just me though. xD
Probably you've found help by now, but you could basically just switch the language on your phone/computer to Greek and then all notifications/settings/etc will be in Greek? Or you could change the language of your social media such as FB. I think that's sort of what you mean :)