The sentence is : 'Here the Galactica Actual.'
Galactica = ship name
& it's the captain that is speaking.
Others sentences : 'Thank you, actual.'
& : 'I request permission to speak with Galactica actual.'
I think that Galactica Actual is the command centre for this game.
Starships contact Galactica Actual (sometimes they leave out Galactica and just say Actual) to report, to hear what is happening elsewhere, and to get more orders.
In the Startrek programme and films, Starfleet Command was the central authority.
You would need to ask on the French forum for a word for actual. It would not need to be a literal translation.
OK, I've just looked at the French thread.
In this game, if someone wants to speak to the real person behind Galactica, they ask to speak to Galactica Actual. If that person is speaking to the gamers as a real person, not in the Galactica role, s/he signs as Galactica Actual.