Fix lazy loading for free-jqgrid languages #2803

Webpack put the languages files inside of public/public/build/free-jqgrid.
So we need move that directory inside of public/build/free-jqgrid.

assets/js/free-jqgrid.js

@@ -12,6 +12,6 @@ const langs = [
 locale = langs.indexOf(locale) !== -1 ? locale : 'en';
 
 import(
-    /* webpackChunkName: "free-jqgrid/i18n/" */
+    /* webpackChunkName: "../public/build/free-jqgrid/i18n/" */
     'free-jqgrid/js/i18n/grid.locale-' + locale
 );

webpack.config.js

@@ -1,5 +1,6 @@
 var Encore = require('@symfony/webpack-encore');
 var copyWebpackPlugin = require('copy-webpack-plugin');
+var fileManagerPlugin = require('filemanager-webpack-plugin');
 
 Encore
     .setOutputPath('public/build/')
@@ -53,4 +54,19 @@ themes.forEach(function (theme) {
     ]));
 });
 
+// Fix free-jqgrid langiages files
+Encore.addPlugin(new fileManagerPlugin({
+    onEnd: {
+        move: [
+            {
+                source: './public/public/build/free-jqgrid/',
+                destination: './public/build/free-jqgrid/'
+            }
+        ],
+        delete: [
+            './public/public/'
+        ]
+    }
+}));
+
 module.exports = Encore.getWebpackConfig();