Correct me if I'm wrong, but if I edit the es.po file in my database, it won't be overwritten unless I run an update.
In that case, I guess I can back up the file and replace the one installed with the update.
You're right; but sometimes it could be better to save a text file with all the modifications you made and adapt the new .po file in case of important (translated) changes in the software
Thank you for the information. I have considered sending my localised po. However, although some of the modifications were corrections to the po file available, other were particularly addressed to the purpose of my survey.