interface: do not bundle extra locales

Landscape is not localised in any fashion and we never change the
default locale. As such, the locales that moment.js includes in the
bundle are redundant and can be removed

pkg/interface/config/webpack.prod.js

@@ -1,6 +1,7 @@
 const path = require('path');
 // const HtmlWebpackPlugin = require('html-webpack-plugin');
 const { CleanWebpackPlugin } = require('clean-webpack-plugin');
+const MomentLocalesPlugin = require('moment-locales-webpack-plugin');
 
 module.exports = {
   mode: 'production',
@@ -49,6 +50,7 @@ module.exports = {
   //   historyApiFallback: true
   // },
   plugins: [
+    new MomentLocalesPlugin(),
     new CleanWebpackPlugin(),
     // new HtmlWebpackPlugin({
     //   title: 'Hot Module Replacement',

pkg/interface/package.json

@@ -71,6 +71,7 @@
     "eslint-plugin-react": "^7.19.0",
     "file-loader": "^6.0.0",
     "html-webpack-plugin": "^4.2.0",
+    "moment-locales-webpack-plugin": "^1.2.0",
     "react-dnd": "^11.1.3",
     "react-hot-loader": "^4.12.21",
     "sass": "^1.26.5",