docs: localization docs

[maehr]

Pull request

Proposed changes

As discussed with @owikle @evanwill and @koilebeit we start with the docs for the new localization feature CollectionBuilder#48

Types of changes

• New feature (non-breaking change which adds functionality).
• Enhancement (non-breaking change which enhances functionality)
• Bug Fix (non-breaking change which fixes an issue).
• Breaking change (fix or feature that would cause existing functionality to change).

Checklist

• I have read the CONTRIBUTING document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.