I'd like to translate the control panel to spanish, is the translation already available, if not, how could I collaborate to translate it?
Magento team have started translation project on this service
You can contribute to official translate there or make your own translation.
How to make language pack you can find there
Oh, thanks!, is this the one for magento 1 (I'm using magento 18.104.22.168 will it work if I traduce it all?)?
is that official? Why just argentina and not Chile?