A json-file is needed to use localization in Kendo React. It's a lot of work to maintain these files when there are new versions. It's difficult to know which keys have been added, changed or removed.

One way that would really help is if you create a way for us to upload our custom-json and then it adds the missing translations, remove those that you have removed, and update the names of those that has been renamed.

Another better way might be that you collect the translation for different languages and let us download them. That way you can also keep them up to date.