optimize bundle size and resize/sharp image upload

fix #11

client/vue.config.js

@@ -1,9 +1,16 @@
+const webpack = require('webpack')
+
 process.env.VUE_APP_API = process.env.NODE_ENV === 'production' ? process.env.BASE_URL || 'http://localhost:9000' : 'http://localhost:9000'
 process.env.VUE_APP_TITLE = process.env.TITLE || 'Gancio'
 process.env.VUE_APP_DESCRIPTION = process.env.DESCRIPTION || 'Event manager for radical movements'
 
 module.exports = {
   publicPath: process.env.BASE_URL,
+  configureWebpack: {
+    plugins: [
+      new webpack.NormalModuleReplacementPlugin(/element-ui[\/\\]lib[\/\\]locale[\/\\]lang[\/\\]zh-CN/, 'element-ui/lib/locale/lang/en')
+    ]
+  },
   devServer: {
     disableHostCheck: true
   },