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

Frontend-Learner/i18n/locales/en.json

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+{
+  "app": {
+    "title": "e-Learning System"
+  },
+  "dashboard": {
+    "welcomeTitle": "Welcome back",
+    "welcomeSubtitle": "Today is a great day to learn something new. Let's gain more knowledge!"
+  },
+  "menu": {
+    "continueLearning": "Continue Learning",
+    "recommendedCourses": "Recommended Courses",
+    "goToLesson": "Go to Full Lesson",
+    "viewDetails": "View Details",
+    "searchCourses": "Search courses..."
+  },
+  "course": {
+    "currentlyLearning": "Currently Learning",
+    "progress": "Progress",
+    "duration": "Duration"
+  },
+  "language": {
+    "label": "Language / ภาษา",
+    "thai": "ไทย",
+    "english": "English"
+  },
+  "common": {
+    "newBadge": "New",
+    "popularBadge": "Popular"
+  }
+}

Frontend-Learner/i18n/locales/th.json

@@ -0,0 +1,30 @@
+{
+  "app": {
+    "title": "ระบบ e-Learning"
+  },
+  "dashboard": {
+    "welcomeTitle": "ยินดีต้อนรับกลับ",
+    "welcomeSubtitle": "วันนี้เป็นวันที่ดีสำหรับการเรียนรู้สิ่งใหม่ๆ มาเก็บความรู้เพิ่มกันเถอะ"
+  },
+  "menu": {
+    "continueLearning": "เรียนต่อจากเดิม",
+    "recommendedCourses": "คอร์สเรียนแนะนำ",
+    "goToLesson": "เข้าสู่บทเรียนเต็มตัว",
+    "viewDetails": "ดูรายละเอียด",
+    "searchCourses": "ค้นหาคอร์ส..."
+  },
+  "course": {
+    "currentlyLearning": "กำลังเรียนอยู่",
+    "progress": "ความคืบหน้า",
+    "duration": "ระยะเวลา"
+  },
+  "language": {
+    "label": "ภาษา / Language",
+    "thai": "ไทย",
+    "english": "English"
+  },
+  "common": {
+    "newBadge": "ใหม่",
+    "popularBadge": "ยอดนิยม"
+  }
+}