Add new index.js that re-exports the locale-data and supported-locales so that dependents of scratch-l10n can continue to work without changing. (With corresponding changes in webpack.config.js and package.json.)
* Separate locale-data from supported languages, and export as a separate entry in webpack
* copy react-intl locale-data locally So we can continue to support dependent packages with locale-data until we switch to polyfils. Don’t lint these files with our rules.
* bumped minor version
* added localeMap for converting between transifex locales and the ones used by Scratch (e.g., pt-br - pt_BR)
* using the transifex node package to automatically sync translations
* added scripts:
* sync_tx_src: uploads an en.json source file, for use by client packages
* sync_tx_translations: downloads gui translations, used by this repo, flattens Chrome i18n json into plain key-value json.
* sync_tx_blocks: same as above, but blocks need slightly different handling
* validate_translations: check the translation json files for basic translation errors
* tx_util - methods shared by sync and validate
* simplified build-data because jsons have already been flattened
* added new npm tasks
