While testing the fix for CR 6275682, I've came across several country names that are inconsistent with CLDR. There are probably more incorrect names than listed, I will update the bug later on. The correct names are as follows:

av - avar
cu - eslavo eclesiástico
ff - fula
gv - gaélico manés
ig - igbo
ii - sichuan yi
kg - kongo
ki - kikuyu
kj - kuanyama
lu - luba-katanga
nb - bokmal noruego
nd - ndebele septentrional
nn - nynorsk noruego
nr - ndebele meridional
os - osético
se - sami septentrional
ty - tahitiano