This is (as are every talent description bugs) a bug in Blizzard pages. I used the information from the european armory website to generate 2.3 Talented_Data, because it was the first to be updated. It seems that the update has only been half done.
Right now, the www.worldofwarcraft.com website has a more recent talent description data. I'm updating Talented_Data with it right now.
That doesn't surprise me one bit, character panes in Armoury are still showing the old stats instead of the Weapon Expertise. Thanks for the update. :)