I have created a list of unrecognised languages, using w:List of languages by number of native speakers for 5 million+, and a few others I know of in the 1 million+ range. It would be good if someone closer to the code can double check it. I think we should link the ISO codes to the relevant translatewiki page, like translatewiki:Portal:ban, as that provides stats and a list of translator usernames.
