Fix some bugs with the language file.

Woops. Fixed the planet name and description.
Make Makemake stone better

I heard you liked Makemake, so I made Makemake make Makemake make
makers.
Create Europa Assets

MelonSoldier
Update Jupiter to allow moons.

Modify registration of the planet to sync it to a variable. This allows
moons to be created.
Create Europa

Yay Europa!
Merge pull request #34 from KingFluffyXVI/master

Updates