Some of the ones in ours (Hanley) appear to be in German, so I'm assuming the cards are in German too. Is this common?
Yes they are. I bought a couple and it turns out that the cards are in german, but the ships are in english. So it was kind of a good deal anyhow, since I have plenty of cards, so I don't really need more. And you can still use the ships because they are in plain English.
This is only with the original edition. The rest (Scum and Villainy, Ground Assault, etc.) should all be in English.
Still, it's kindda weird why they do that (selling a german product in the uk). Isn't it easier to just sell it in Germany?