'Bottom, thou art translated.'

[Lalaith]

Well, they kind of do, because both were terms formerly used by colonists of that country, to refer to indigenous populations. I don't think "native" used in this sense is particularly PC, in fact to refer to people as "natives" is rather offensive although I agree, not as offensive as Skraelingar.
I think the Vikings did use this somewhat dismissively and insultingly, because they found the wearing of skins barbaric. In terms of just how insulting, I suppose it would be on a par with calling native Americans, "Redskins".

What was the name of the Vinland translator btw?

As for Bilbo saying "Good heavens" in Russian, I personally wouldn't have thought about the religious significance until it was pointed out, it's not like saying "Good God" to my mind. Also I'm sure that in the Hobbit he does say "Bless me" which also has religious connotations does it not?

If you like, I'll check the Icelandic translations of Tolkien to see if I find anything interesting.