I seem to recall the Translatable documentation finding it's way into the new doc.silverstripe.org, but it's not there now. Will it find it's way (back) in? Does this maybe have something to do with the fact that Translatable is (going to be) a separate module?
I just sort of 'know' that it was there before, in the new documentation, recently. I distinctly remember the 'black' code-boxes - but that could be wishfull thinking... I was triggered by this post http://www.silverstripe.org/general-questions/show/9331 to look for it again and found it missing.
martimiz - it is because Translatable has been moved out to a module for 3.0. The documentation only pulls doc files from core sapphire and cms not any modules at the current point of time. The sapphiredocs module needs a couple bugfixes to work with modules.