Specifically, as a <Language> element, similar to “NiceShooting” or “WatchYourTargets” or the like.

nms 31 Mar 2017:

Are you talking about text that already appears in game? When does it appear/ would you like it to appear?

assumedpseudonym 31 Mar 2017:

 Trying to dock at a hostile station or a station you’ve been blacklisted at has the station give you a “Permission denied” message. According to George in last night’s stream postgame, this is hardcoded and can’t be changed. He suggested I ticket it as a request, so I did.

nms 2 Apr 2017:

Ah, you mean "Docking Request Denied".

assumedpseudonym 2 Apr 2017:

 Yeah, my bad, got the specific text wrong. Was actually coming here to update that.

george moromisato 25 Apr 2017:

In 1.8 Alpha 1 I added core.dockingRequestDenied as a language element. If you station (or ship) has this text ID, we will use it instead of the default. You can also add this to a sovereign's language element.