translation to Spanish

Hi,

I am looking information regarding translation process. I would need to translate all  my screens into Spanish, and I would like to know what pieces I need to consider to do it.

I know Acher does not do all the magic by itsef, and also know that one of the pieces is a file that contains all the labels ( fields, error messages, help text, bottoms labels, etc)  that need to be translate. what else I need?  is there a Archer software piece  that need to be purchased , right? what is the name? how much it would cost?

thanks! CMB