Unfortunately, the Dutch language is still missing. Probably due to the fact the required percentage hasn't been met yet... So perhaps we will have to wait for the next release for that to happen.
As of this release, you can also get the latest version from concrete5 by going to "http://concrete5.org/latest.zip". So if you can think of a useful script for that or just want to use that direct link for all your future installs, go ahead. Should come in handy I guess!
Go to the full concrete5 188.8.131.52 release notes