Dk beast is 6.68, that client wont work for you.
There used to be dk foster client, that had translated items etc.
But otherwise you just need to get the dpk open, and edit item.info with etc HeX editor and translate everything.
This is guide how to edit it with HeX editor.
[You must be registered and logged in to see this image.]It takes time to understand, but when you get the hang of it, it wont be that hard, it just takes alot of time to finish the whole info file.
With rank_description.info, skill.info you can just take from other clients .dpk, they will work fine inside older clients.