you should work for Samsung if you don't already! 35 minutes I was on a chat with them about this and was told if I wanted to sort the issues with predictive text I would have manually add all the possible variations I may have in the language shortcuts! they actually told me that! went as far as to say that the predictive text was an ongoing issue with the new software and that it was being looked in to!!!
See this is the thing with companies like this, they give the helpdesk a script, instead they should give them a hands on experience.
I figured out how to do this by myself by going through as many settings as I could and finally got it. They own the devices so they should know how to work them 😂.
Thanks for the reply though just glad I could help some people out.