Yeah, the Norse and Christians both have an emphasis on language just in very different ways.
With the Norse it's an exclusivity and emphasis that their language is better and more powerful. It is speaking Norse that is the prerequisite to be a citizen and fall under the Law, after all, and that language is also magical, in the form of both runes and galdr (which are spoken spells). They don't have magic to speak other languages because their language is better than those languages and allows potent magics in its own rights. Other languages may be useful, but they aren't important, mystically speaking.
For Christians, meanwhile, language is a means to enable communication and cooperation primarily. Look at the Tower of Babel, after all, and what men could do when they all spoke the same tongue. Combine that with the evangelism and you have a culture ripe for 'and I speak your language' as a thing they can do easily because speaking other tongues is important to who they are and their understanding of what language is for.
