Hello,
Some great news! APT has Tooltips in Portuguese thank to Nelson Viegas, one of the very first supporters. Many thanks Nelson!
The second news is that Robert Vice was very kind to edit the English version and made it much more understandable and clear. Many thanks Robert!
Both files can be found in the "Downloads" page on APT site.
Now the available translations are : Dutch, Polish, German and Portuguese
Also I'm expecting the French one to be finished very soon.