fix: 補充翻譯(註冊Error)

lib/RegisterPage.dart

@@ -6,6 +6,8 @@ import 'package:mailer/mailer.dart';
 import 'package:mailer/smtp_server.dart';
 import 'package:validators/validators.dart' as validator;
 
+import 'generated/l10n.dart';
+
 void main() {
   runApp(MaterialApp(
     home: RegisterPage(),
@@ -105,12 +107,12 @@ class _RegisterPageState extends State<RegisterPage> {
     final email = _emailController.text;
     if (email.isEmpty) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('請輸入電子信箱地址')),
+        SnackBar(content: Text(S.of(context).register_error_email_empty)),
       );
       return;
     } else if (!validator.isEmail(email)) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('請輸入正確的電子信箱')),
+        SnackBar(content: Text(S.of(context).register_error_email_invalid)),
       );
       _emailFocusNode.requestFocus();
       return;
@@ -129,7 +131,7 @@ class _RegisterPageState extends State<RegisterPage> {
 
     if (name == '') {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('用戶姓名不可為空')),
+        SnackBar(content: Text(S.of(context).register_error_username_empty)),
       );
       _nameFocusNode.requestFocus();
       return false;
@@ -137,7 +139,7 @@ class _RegisterPageState extends State<RegisterPage> {
 
     if (email == '') {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('電子信箱不可為空')),
+        SnackBar(content: Text(S.of(context).register_error_email_empty)),
       );
       _emailFocusNode.requestFocus();
       return false;
@@ -145,7 +147,7 @@ class _RegisterPageState extends State<RegisterPage> {
 
     if (password == '') {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('密碼不可為空')),
+        SnackBar(content: Text(S.of(context).register_error_password_empty)),
       );
       _passwordFocusNode.requestFocus();
       return false;
@@ -153,14 +155,14 @@ class _RegisterPageState extends State<RegisterPage> {
 
     if (_generatedCode == ''){
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('請先發送驗證碼')),
+        SnackBar(content: Text(S.of(context).register_error_verificationCode_not_send)),
       );
       return false;
     }
 
     if (code == '' || code != _generatedCode) {
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('驗證碼錯誤')),
+        SnackBar(content: Text(S.of(context).register_error_verificationCode_not_match)),
       );
       _codeFocusNode.requestFocus();
       return false;
@@ -189,7 +191,7 @@ class _RegisterPageState extends State<RegisterPage> {
 
       if (result.rows.isNotEmpty) {
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('註冊失敗：電子信箱或帳號名稱已被使用，請嘗試更換或登入')),
+          SnackBar(content: Text(S.of(context).register_error_usernameOrEmail_exist)),
         );
       } else {
         await conn.execute(
@@ -197,7 +199,7 @@ class _RegisterPageState extends State<RegisterPage> {
           {'name': name, 'email': email, 'password': password},
         );
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(content: Text('註冊成功！')),
+          SnackBar(content: Text(S.of(context).register_success)),
         );
 
         Navigator.pushReplacement(
@@ -214,7 +216,7 @@ class _RegisterPageState extends State<RegisterPage> {
     } catch (e) {
       print('資料庫錯誤: $e');
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text('註冊失敗：系統錯誤')),
+        SnackBar(content: Text(S.of(context).register_error_server_error)),
       );
     } finally {
       await conn.close();
@@ -375,7 +377,7 @@ class VerifyPage extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('註冊成功'),
+        title: Text(S.of(context).register_success),
       ),
       body: Center(
         child:  Column(
@@ -388,7 +390,7 @@ class VerifyPage extends StatelessWidget {
                 // 返回登入頁面
                 Navigator.pop(context);
               },
-              child: Text('返回登入頁面'),
+              child: Text(S.of(context).register_turn_back),
               style: ElevatedButton.styleFrom(
                 backgroundColor: Color(0xFF4FC3F7),
                 padding: EdgeInsets.symmetric(horizontal: 30, vertical: 15),