feat: Implement internationalization with English and Thai locales and a language switcher.

Frontend-Learner/i18n.config.ts

@@ -0,0 +1,18 @@
+/**
+ * @file i18n.config.ts
+ * @description Vue I18n configuration for the E-Learning Platform.
+ * Supports Thai (th) and English (en) locales.
+ */
+
+import th from './i18n/locales/th.json'
+import en from './i18n/locales/en.json'
+
+export default defineI18nConfig(() => ({
+  legacy: false,
+  locale: 'th',
+  fallbackLocale: 'th',
+  messages: {
+    th,
+    en
+  }
+}))