Fix niceNum implementation

[danmooney2]

Description

Previous state hardcoded the thousands separators. I'm not sure which locale uses an apostrophe (') as a thousands separator but for the majority of the world that is not correct. Number.prototype.toLocaleString will format numbers based on user's locale.

Source: https://docs.oracle.com/cd/E19455-01/806-0169/overview-9/index.html

Related Issue

Motivation and Context

Readability

How Has This Been Tested?

Locally

Screenshots (if appropriate):

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.