I'm also living this problem in two different pc, Mexican Spanish, fully updated, nothing from ppas, backports, or any other external repos involving kde. I created a new user in one of them, and this new user has translations fully updated and working.
I got back to my user, and translations are messed up, almost everything in spanish, but some topics still in english. I tried changing the language to english, rebooted, back to spanish, and the same problem... I removed spanish translations, rebooted, reinstalled and everything is the same.
I also think there's a user cache not being correctly updated.
I'm also living this problem in two different pc, Mexican Spanish, fully updated, nothing from ppas, backports, or any other external repos involving kde. I created a new user in one of them, and this new user has translations fully updated and working.
I got back to my user, and translations are messed up, almost everything in spanish, but some topics still in english. I tried changing the language to english, rebooted, back to spanish, and the same problem... I removed spanish translations, rebooted, reinstalled and everything is the same.
I also think there's a user cache not being correctly updated.