Add props for FileUploader i18n support

[brandongregoryscott]

Overview

Resolves #1459

This PR introduces two new props to the FileUploader to allow the inner/CTA text as well as the validation message on drag to be overridden. The default behavior/copy should remain the same and these props are optional.

Screenshots (if applicable)

(From Storybook)

Custom browseOrDragText function that returns a string

Custom dragMaxFilesMessage function

Documentation

• [x] Updated Typescript types and/or component PropTypes
• [ ] Added / modified component docs
• [x] Added / modified Storybook stories

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