I think he's asking if it's ok to re-do some of the HUD icons etc in space (the F-key icons at the top, specifically).
That's fine by us. We've got an artist who's volunteered to work on some of the interface aspects of the game (Greent) so it's likely that we'll be changing all of this stuff sometime in the future. If, in the meantime, you want to play with your own versions of these things... or make them available to other players... I don't see why not.
I've been using a slightly different interface in space for a while now - I was attempting to improve it, and only succeeded marginally. As you can see - different fkey icons and window surrounds:
I had some different drive icons too, until mit changed the way that stuff is displayed.
If you really do have a Portugese translation of the manual I'd be very surprised. There isn't a manual :) But if it's helpful to other players that speak Portugese, that sounds good to me. Probably the best thing to do is to post a link to it here.