It seems Spore will use your countrys language in-game, and as most know the translations aren't often that great. Most likely it's the language of your OS that dictates what will be used. After searching around I found a fix for this problem: Create a shortcut, select properties and change the shortcut path to "X:\XXX\Sporebin\SporeApp.exe" -L:english if you want it in english. The X'es will be the path for where you installed the game.
This edit will also create new pages on Giant Bomb for:Beware, you are proposing to add brand new pages to the wiki along with your edits. Make sure this is what you intended. This will likely increase the time it takes for your changes to go live.