No more alert and confirmation dialogs

Please stop using an `alert` to let me know that "It might take up to 5 minutes for this Style to appear in the "Recently Updated" section.". I find it quite annoying when I am working in another tab and I have to stop to click the popup.

Also, I don't need a confirmation dialog to answer "Are you sure you want to update '...'?". I didn't accidentally click the update button.

Thank you.