v5.1 release for English versions - A few minor design improvements

Note: None of the following v5.1 changes affect gameplay, so I would not suggest reprinting the cards if you've already printed off v5.0 files (released from February 27 - March 27, 2023).

• The Grip attribute was changed to an Illusory Prison.
  
• The Book+Pencil attribute was changed to a Edited Page.
• All instances of "face-down"/"face-up" have been changed to "facedown"/"faceup".
• In the bottom-left section of the card, "Core Set" is in white text against a black background to more easily distinguish those cards from expansion cards.
• The wording for Feragot's Fortress has been changed from "You may peek at a face-down card in the deck. If there are none, lose the game!" to "Peek at a facedown card in the deck. If there are none, lose the game!" This wording change was made because some players thought that by choosing not to peek at a facedown card in the deck when there were none, they could avoid the game-losing clause of the 2nd sentence which was not the intended interpretation. To avoid this confusion going forward, the choice to peek at a facedown card or not (in attempt to avoid the 2nd part of the ability) has been removed.