bg BG is not available in the installation…

bg_BG is not available in the installation process of 4.0.

Testing the issue with the failing downloads from RosettaRosetta The code name of the theme for the local WordPress sites (eg. is a “Rosetta” site). All locale specific WordPress sites are referred to as “Rosetta sites.” The name was inspired from the ancient Rosetta Stone, which contained more or less the same text in three different languages. sites, I tried to make a fresh install of 4.0 to make sure choosing a language works there and I found that bg_BG is missing from the languages list.

It’s at 100% on The platform for contributing to the translation of WordPress core, themes and plugins. and was there when 4.0 was released. This is a recent problem.

The current list of languages available is in these screenshots: