Add docstring

locale/locales.js

@@ -1,3 +1,10 @@
+/*
+ * This file specifies the language dependencies.
+ *
+ * Translations take up a lot of space and you are therefore advised to remove
+ * from here any languages that you don't need.
+ */
+
 (function (root, factory) {
     require.config({
         paths: {