Update intl

[OtterleyW]

More information about the changes can be found from Upgrade guide for [email protected]

• Proptype intlShape was removed so we needed to create it again. Because of this we added a new util/reactIntl.js file. This file is now used to wrap all the react-intl related imports.
• addLocaleDate function was removed and react-intl library is now relying on native Intl APIs: Intl.PluralRules and Intl.RelativeTimeFormat. In order to support older browsers we needed to add intl-pluralrules and intl-relativetimeformat to util/polyfills.js
• Also Node must be now compiled with full-icu which caused changes to start and test
  scripts in package.json. We also needed to add a specific config for nodemon
• Default textComponentin IntlProvider changed to React.Fragment so we need to explicitly
  set textComponent to span. Otherwise all the snapshots would have changed and it might affect to UI if there is styles added to these spans generally in customization projects.

Note: FormattedMessage component now supports tagName prop and improved rich-text formatting.

[Gnito]

LGTM