feat: i18n 개선 및 userfront 로그인/로케일 보완

userfront/lib/i18n.dart

@@ -1,40 +1,18 @@
-import 'dart:ui';
+import 'package:easy_localization/easy_localization.dart';
 
-import 'i18n_data.dart';
+final _koreanPattern = RegExp(r'[가-힣]');
 
-const _defaultLocale = 'ko';
-const _supportedLocales = ['ko', 'en'];
-
-String _resolveLocale() {
-  final locale = PlatformDispatcher.instance.locale;
-  final code = locale.languageCode.toLowerCase();
-  if (_supportedLocales.contains(code)) {
-    return code;
+String tr(String key, {String? fallback, Map<String, String>? params}) {
+  try {
+    if (fallback != null && _koreanPattern.hasMatch(fallback)) {
+      fallback = null;
+    }
+    final translated = key.tr(namedArgs: params);
+    if (translated == key && fallback != null && fallback.isNotEmpty) {
+      return fallback;
+    }
+    return translated;
+  } catch (_) {
+    return fallback ?? key;
   }
-  return _defaultLocale;
-}
-
-String _formatTemplate(String template, Map<String, String>? params) {
-  if (params == null || params.isEmpty) {
-    return template;
-  }
-  var result = template;
-  params.forEach((key, value) {
-    result = result.replaceAll('{{$key}}', value);
-  });
-  return result;
-}
-
-String tr(
-  String key, {
-  String? fallback,
-  Map<String, String>? params,
-}) {
-  final locale = _resolveLocale();
-  final map = locale == 'en' ? enStrings : koStrings;
-  final value = map[key];
-  final template = (value != null && value.isNotEmpty)
-      ? value
-      : (fallback ?? key);
-  return _formatTemplate(template, params);
 }