Hm that's strange, the dictionary feature came up with PW1 and I was very disappointed when I find out it's missing on my new PW2, but with that last update they brought it back. It's weird to remove it from PW1 with this update that bring you all new PW2 features. The difference on PW2 is that the switch "button" is on the bottom of definition not on Dictionary tab like PW1
(screenshot), is there any chance you've missed that?