Petr Kadlec, 30/10/2013 22:18:And some are just locales which don't exist in CLDR yet. Thanks for this list! Just to confirm, those you took from CLDR are all language autonyms, i.e. the language name in that language?
So, I compiled a list  of 39 differences in language names between
MW core and the CLDR extension. Some of those differences are just case
changes, some of them might be errors in one of the sources, some of
them just random choices between two equally valid versions (like in the
Czech case, it’s not like one of them is generally better than the
other, it’s just that consistency would be better).