Though a lot (if not all) of the voice lines are taken directly from the first game, where aren't nearly as distorted, so that might be a better place to start

So if given enough time, you could probably learn their language (assuming this shit actually means anything)

The spoken language, however, is a mix between a bunch of different languages, like English, Russian and Swedish.

But it isn't gibberish, they have words that can be recognized and heard in multiple voice lines

The written language is just Swedish with a funny font