Merge branch 'silence-webpack' into 'master'

only print errors and warnings from webpack dev server

See merge request !9118

config/webpack.config.js

@@ -117,7 +117,8 @@ if (IS_PRODUCTION) {
 if (IS_DEV_SERVER) {
   config.devServer = {
     port: DEV_SERVER_PORT,
-    headers: { 'Access-Control-Allow-Origin': '*' }
+    headers: { 'Access-Control-Allow-Origin': '*' },
+    stats: 'errors-only',
   };
   config.output.publicPath = '//localhost:' + DEV_SERVER_PORT + config.output.publicPath;
 }