update Spanish translation - #1062

Thanks @lulol, that was pretty quick. 😄

Should it be merged as is, or would it be better to make a bunch of screenshots showing the strings at runtime first?

I think that is not necessary to take screenshots. The translation was mostly straightforward.

The only thing that may worth to check is if the resulting text formatting looks right for the key cypher dialog and the Plot load button tooltip, since in both there were too long lines I did split them in the translation.

The Plot loading tooltip seems fine (bottom right corner):

The key cypher dialog I'll check later, when I switch to my OSX desktop later on tonight. 😄

They SQLCipher dialog seems ok too, so this does look good to merge as-is:

Thanks heaps @lulol. 😄