refactored locale.js for ES6 arrow functions

src/locale.js

@@ -42,7 +42,7 @@
 
 /*global modules, contains*/
 
-modules.locale = '2020-January-28';
+modules.locale = '2020-April-27';
 
 // Global stuff
 
@@ -82,26 +82,24 @@ Localizer.prototype.languageName = function (lang) {
 };
 
 Localizer.prototype.credits = function () {
-    var txt = '',
-        myself = this;
-    this.languages().forEach(function (lang) {
+    var txt = '';
+    this.languages().forEach(lang => {
         txt = txt + '\n'
-            + myself.languageName(lang)
+            + this.languageName(lang)
             + ' (' + lang + ') - '
-            + myself.dict[lang].language_translator
-            + ' - ' + myself.dict[lang].last_changed;
+            + this.dict[lang].language_translator
+            + ' - ' + this.dict[lang].last_changed;
     });
     return txt;
 };
 
 Localizer.prototype.unload = function () {
     var dict,
-        keep = ['language_name', 'language_translator', 'last_changed'],
-        myself = this;
-    this.languages().forEach(function (lang) {
+        keep = ['language_name', 'language_translator', 'last_changed'];
+    this.languages().forEach(lang => {
         var key;
         if (lang !== 'en') {
-            dict = myself.dict[lang];
+            dict = this.dict[lang];
             for (key in dict) {
                 if (Object.prototype.hasOwnProperty.call(dict, key)
                         && !contains(keep, key)) {