Export button title should be based on the display title

Hello,

I've just noticed a "bug" when you have multiple exports on the same view.
If you attach several exports to the same view, you will have multiple buttons with always the same name because it's based only on the view name whearas it should be based on the display name in order to differenciate the buttons.
You still have a different URL for each button and the browser will show you the URL but it is not user friendly at all.

I've done a patch in order to change the button name with the display name and not the view name.