Quick improvement & fixes

Hello,

Here's the 1st post-release update with a few fixes and readability  improvements:

• Less wind trail FX (now you only see yours, not the opponent's, which clutters less the screen).
• Fix Lantern Festival readability + more rocks on the edges
• Fix stuck AI sometimes
• Fix Celtic Lands bug on final shortcut with piloting help
• Fix some spanish translations
• Add Penguin trails
• Faster acceleration
• Fix hint size on 4K displays
• Update of the Itch.io page description + trailer

Thanks a lot for all the great feedback :)

I shall fix other things in the future, mainly track readability again, and also AI which is not well balanced.

I hope you'll have fun!

Cheers!