for anyone who runs into this, make sure to change the ":" to a space, like this for a modern version of windows (or it won't work at all)
"C:\Program Files\Electronic Arts\SPORE\Sporebin\SporeApp.exe" -L en-us
2021 update:
For Origin people, rightclick the game within your game library inside of Origin and click "Game Properties". Go to the "ADVANCED LAUNCH OPTIONS" tab and type "-L en-us" inside of the argument box (without the quotes)
If you have the game on disc you are able to redeem your physical copy within Origin, just "ADD A GAME" and "Redeem Product Code...". Type in your licence key and select the correct Spore version (depending on languages) after hitting next.