Add code to enable localisation.

resources/assets/js/app.js

@@ -1,4 +1,3 @@
-
 /**
  * First we will load all of this project's JavaScript dependencies which
  * includes Vue and other libraries. It is a great starting point when
@@ -8,11 +7,15 @@
 require('./bootstrap');
 window.Vue = require('vue');
 
-
 import moment from 'moment';
 import accounting from 'accounting';
+import Lang from './lang.js';
 
-Vue.filter('formatDate', function(value) {
+Vue.filter('trans', (...args) => {
+    return Lang.get(...args);
+});
+
+Vue.filter('formatDate', function (value) {
 
     if (value) {
         moment.locale(window.language);
@@ -20,22 +23,21 @@ Vue.filter('formatDate', function(value) {
     }
 });
 
-Vue.filter('formatAmount', function(value) {
+Vue.filter('formatAmount', function (value) {
     if (value) {
         value = parseFloat(value);
-        var parsed = accounting.formatMoney(value, window.currencySymbol, window.frac_digits,window.mon_thousands_sep,window.mon_decimal_point,accountingConfig);
-        if(value < 0) {
+        let parsed = accounting.formatMoney(value, window.currencySymbol, window.frac_digits, window.mon_thousands_sep, window.mon_decimal_point, accountingConfig);
+        if (value < 0) {
             return '<span class="text-danger">' + parsed + '</span>';
         }
-        if(value > 0) {
-        return '<span class="text-success">' + parsed + '</span>';
+        if (value > 0) {
+            return '<span class="text-success">' + parsed + '</span>';
         }
         return '<span style="color:#999;">' + parsed + '</span>';
     }
 });
 
 
-
 /**
  * Next, we will create a fresh Vue application instance and attach it to
  * the page. Then, you may begin adding components to this application
@@ -62,9 +64,6 @@ Vue.component(
 );
 
 
-
-
-
 const app = new Vue({
-    el: '#app'
-});
+                        el: '#app'
+                    });

resources/assets/js/lang.js

@@ -0,0 +1,30 @@
+/*
+ * lang.js
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
+ *
+ * This file is part of Firefly III.
+ *
+ * Firefly III is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Firefly III is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+// Inside my /resources/assets/js/lang.js
+import lang from 'lang.js';
+import messages from './messages';
+
+const Lang = new lang({messages});
+
+Lang.setLocale(window.language);
+Lang.setFallback('en_US');
+
+export default Lang;