feat(FilePicker): props for i18n support

[KillerCodeMonkey]

Overview

• Added props to translate all hard coded labels and texts in the FilePicker Component
  • inputText - a function called with File[] and returning the value string
  • browseOrReplaceText - a function called with the file count (number) and returning a string for the button tex
• Added tests + fixed and activated the "onBlur" test
• Fixed styling (missing marginLeft -1 for button)
• removed the unnecessary dependency to react-test-renderer only to make snapshots -> use testing library for it

Screenshots (if applicable)

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one file

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Documentation

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

[KillerCodeMonkey]

hey :wave:,

one question: i changed the docs, but when i follow the steps of the readme (even after i did yarn build) the example is not recognizing my new properties.

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[brandongregoryscott]

one question: i changed the docs, but when i follow the steps of the readme (even after i did yarn build) the example is not recognizing my new properties.

The doc site references a published version of the package, so it won't pull in local changes without a little bit of work. I think we're probably OK to leave this change out of the doc site since we don't really call out internationalization for any other component docs.

[brandongregoryscott]

Thanks for the contribution, @KillerCodeMonkey!