Hi Alexandros,
I can translate that site to English soon. However, you can still follow the install file that is listed in that site (the install file is in english). The install tutorial is also in English.
About [pix_colorclassify], this is in the current Gem git repository (the official one). It has to be installed from source, as described in the install instructions for the AirHackTable, and also in the following link:
http://puredata.info/docs/developer/WorkingWithPdExtendedSources
Best,
Btw, about the [pix_coloclassify], where can I find this object? Is it available for os x?
Greets, Alexandros