Hi lopo, I have updated all fields for the spanish translation. Please note: I use extensively custom post types so my actual translation preferes to say “original item” instead of “original post/page”. If you think this is not usefull for your plugin, drop me a line and I’ll change that so it fits in a more basic wordpress-user approach. Nevertheless please reconsider the inclusion of the .po files in the general distribution to enable small personalisations.
Thanks for your plugin!