Is it "game breaking"? No. It isn't. It's not going to destroy the experience for me.
However... it shows a certain lack of quality control, and Bethesda should be slightly humbled by it.
Mind you, TES has been rife with grammatical and spelling errors from it's beginnings. So far, I've come across a handful in Skyrim... but nothing like I did in Morrowind or Oblivion.
However, Bethesda should take note of these things. Just because it's a video game, doesn't mean details like this should be acceptable.