I didn't understand how to accomplish step 9 neither.
Ok, so I got me phing 2.16.0... but
1. It's not clearly said from where to run phing? Just guessing: the root of my una installation...
2. phing is requesting a file named "build.xml" - where is it? It's not part of my UNA-v.9.0.0-RC3.zip archive I installed from. Finally found it on https://github.com/unaio/una and copied it to my site
Running phing again actually ended up with a newly created 'packages' directory and my language archive inside.
Yeah, basically working, but all in all a little confusing and time consuming. :)