@snookersky
Sorry, I’m a newbie. Same problem as you. I downloaded the tinymce_language_pack.zip and unzipped it into the directory wp-includes/js/tinymce. I left everything that was in the directory in the directory and just uploaded the pack as an addition. Was that correct?
Simply uploading the contents didn’t fix the problem for me.
(I also just tried removing those three folders and replacing them completely, didn’t fix it either)
Thanks for your help.