So, my poor Spanish skills don't really help here. I understood that you want to repackage the rpy files after translation, but you don't explain if you want them as rpyc file (in which case it's automatic, just launch the game and Ren'py will do it for you), or if you're talking about the rpa archives (in which case,
You must be registered to see the links
is what you are looking for).
This said, translating by directly editing the rpy files is
not the way to do. Firstly you'll need to redo it with every single update of the game, secondly your files may revert changes made by the original author in this update. There's few threads around there talking about translation of Ren'py games, use the powerful search feature of the forum to find them.
Oh, by the way, it's more efficient to translate the whole message, not just the title of the thread. This forum is an English speaking place with few exceptions, almost only limited to generic threads (like by example the french version of "how-to translate ren'py games" or the few "is there other [country] guys ?" ones).