Aww man. So no 1,000 gold from discovering Great Barrier Reef?

Spain's extra happiness remains the same as the existing game; I only changed the discovery gold amounts. I did however update the unique ability text for better clarity. And, as you noticed, I updated the text of the popup window to also remind the player of Spain that they received extra discovery happiness alongside the gold.

Now, I'll answer your question directly. Spain receives double the happiness for discovering natural wonders (along with the modified gold amount) and they also receive double happiness if they're part of the wonder's yield output (along with all other yield types).

In your picture says that aswell she gains "extra happiness" how much happiness extra does she gain now compared to what every other civ gets?