Ultimate Teams

• Added a dedicated check for spaces in teams name, closing #23

You need to regenerate your messages file after this update, or simply add this line:
team-name-contains-space: "&3Sorry but, since it contains a space, &6%TEAM% &3is a &cBANNED &3name!\n&3Please choose another!"
under team-name-is-banned

• fixed %TEAMPREFIX% placeholder not showing the new team prefix when using /team prefix command