* package.json: Add "build:*" targets
* Improve react-intl-translations-manager workflow.
* Added "build:production" to build production bundle.
* Added "build:development" to build development bundle.
* Fix json translation files
* Run `yarn manage:translations` to fix translation files.
* Fix `pl.json` for syntax error.
* translationRunner: auto detect existing languages
* Auto detect existing rfc5646 language tag in *.json filenames
in `app/javascript/mastodon/locale` folder. No need to manually
define every new language in the languages array here.
* translationRunner: add more functionality
* Allow script user to specify language code to check.
* Added available language check.
* Added --force flag to force creation of unexists language.
* Added --help flag and help messages.
* gitignore: ignore npm-debug.log
* Fix webpack error if NODE_ENV is not defined
Default to use 'development' in config/webpack/configuration.js
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