add a friendly localized error message helper

[outofambit]

Supports #3384

I realized that while we have support to show localized console messages, there isn't an easy way to use it in the codebase outside of the fes core code. This new helper would make it so someone can add a new console message with

p5._friendlyLocalizedError('messageKey');

when messageKey is also added a key into our localization json files. And then it could be translated into other languages.

Open to ideas on ways to make this simpler to use! I'd love to have more localized console messages, there's a lot outside of the fes folder that we could add!

Changes:

• adds a friendlyLocalizedError() helper so its easier to add new localized console messages
• includes a couple examples of how to use it

PR Checklist

• npm run lint passes
• [Inline documentation] is included / updated
• [Unit tests] are included / updated