I had to re-install ClassicPress on my localhost running MAMP PRO. After completing the setup, I noticed that the Site Language dropdown is missing in Settings → General. I ran into this issue installing the latest 1.7 version as well as the lasted nightly release of version 2.0.
As mentioned in the enclosed topic below, I added define( 'FS_METHOD', 'direct' ); to the wp-config.php file, but that did not solve the problem unfortunately.
This might be related to API issue we recently had during an upgrade. We’re looking into it right now and will let you know once it’s fixed. Thanks for bringing this to our attention.