Fix react-intl/locale-data import issue on production build (#3937)
Fix react-intl/locale-data import issue on production build (#3937)

Webpack seems to fail to import `react-intl/locale-data/*.js` if those
files has been proceed by babel, and this also breaks applying our translation.

Note that this won't be a problem on English locale, because react-intl
includes it as default and works fine without manually added locale-data.
Also this issue seems to only occurs on production build, but I'm not sure
about reason.
kibousoft/mastodon,kibousoft/mastodon,kibousoft/mastodon,kibousoft/mastodon