translation help

Hi,

I think i’m doing everything correctly, I’m trying to put everything into Mexican Spanish on my site. I downloaded all of the .mo files for each plugin and this language. I translated the whoop_child theme in poedit and uploaded that to my whoop child theme language folder but it’s still not working.

Do the .mo file names need to end with ‘.mo’? Or does that not matter as long as they are .mo files?
Do I also need the .po files uploaded to my server or just the .mo ones?
thanks