I just updated from iOS 7 to iOS 8, and I noticed that the built-in dictionaries, I previously used, aren't working. I had used American English, British English, and Apple Dictionary. Now, when I try to define any word, I get a "No definition found" error. The dictionaries I previously used show a blue circle (while all the others show the cloud download icon).
I tried to download a new dictionary, and I was able to use it. However, that was in another language.
How can I enable these dictionaries again?