Merge pull request 'fix: 회원가입 페이지 UI 텍스트 포맷팅 노출 오류 수정 (Issue #610)' (#618) from fix-test-fixtures into dev

Reviewed-on: baron/baron-sso#618

userfront/lib/core/i18n/toml_asset_loader.dart

@@ -52,8 +52,11 @@ Map<String, dynamic> _expandFlatTranslations(Map<String, String> flatMap) {
 }
 
 String _normalizeLocalizationValue(String value) {
-  return value.replaceAllMapped(
-    RegExp(r'\{\{[[:space:]]*([a-zA-Z0-9_]+)[[:space:]]*\}\}'),
-    (match) => '{${match.group(1)}}',
-  );
+  return value
+      .replaceAllMapped(
+        RegExp(r'\{\{\s*([a-zA-Z0-9_]+)\s*\}\}'),
+        (match) => '{${match.group(1)}}',
+      )
+      .replaceAll(r'\\n', '\n')
+      .replaceAll(r'\n', '\n');
 }