That's funny, Bryn!
Lighter, that's what I thought, too. It's a long long time since I studied Latin, but is it perhaps "I achieve action" or "I activate"?
My Latin dictionary is packed away, and Google didn't show me anything on the words "activo" or "activare". I'm assuming it would be "activare" as we have the English word "activate".
But then again, mottos etc are notorious for using ungrammatical Latin, because people make them up but may not have a good understanding of Latin. Or the Latin has evolved in usage over the centuries in situations such as the Roman Catholic church, which was still using Latin for Mass until relatively recently, so the Latin language has probably evolved even though it is considered to be a dead language.