Hmm doesn't sound too clever. I could only find 'kit packs' like, but there's team names and players to be sorted anarl.
Grab a USB stick. Create a new folder on it, call it WEPES
Unzip the kit pack for the league you want (do one league at a time)* and stick all the kits (image files) into the WEPES folder. Do the same with the manager photos and club badges.
Safely remove the USB then plug the USB into the PS4
Go into PES, edit, data management, import photos. Follow the on screen instructions.
Rinse and repeat
*you don't have to do one league at a time but importing a load of photos is a fuck on