NOTE: Not a pull request because I don't know how you want to implement this.

This lang file changes all Game Rules to use Legacy Console-style names and gives every one a unique description. Some descriptions were pulled straight from PS4 Edition, but Java-exclusive game rules have been given new descriptions in the same style.

en_us.json

Thanks for the lang file and sorry for bothering you, but there are some repeated keys in the lang, which is not a real problem because I know what the real keys are.

Apologies for those repeated keys. They affected the sendCommandFeedback and showDeathMessages gamerule descriptions.

Here is a fixed version of the file. Repeated keys fixed and some slight description changes to better match the Legacy style.
en_us.json