Request for help to revise a Regression lesson translations!

[jlooper]

hi, all, we just refactored one of the Regression lessons: https://github.com/microsoft/ML-For-Beginners/tree/main/2-Regression/3-Linear

The lesson is a lot better BUT we need help revising the translations! If you can take a look at Spanish, Indonesian, Italian, Japanese, Korean, Portuguese (Brazilian and Portugal) and Simplified Chinese, I'd be super grateful!

https://github.com/microsoft/ML-For-Beginners/tree/main/2-Regression/3-Linear/translations