feat: multi-language support

src/locales/lang/en/routes/demo/excel.ts

@@ -0,0 +1,7 @@
+export default {
+  excel: 'Excel',
+  customExport: 'Select export format',
+  jsonExport: 'JSON data export',
+  arrayExport: 'Array data export',
+  importExcel: 'Import',
+};