fix: remove non-descriptive var named stuff

[1jds]

Checklist:

• [ x ] I have read freeCodeCamp's contribution guidelines.
• [ x ] My pull request has a descriptive title (not a vague title like Update index.md)

Closes #XXXXX

This is a twin PR to one against the boilerplate-project-american-british-english-translator repo (https://github.com/freeCodeCamp/boilerplate-project-american-british-english-translator/pull/31).

The reason for this PR is because the variable name 'stuff' is not descriptive or semantic. Changing this will help campers reading the code follow along, and also make the codebase read more professionally.