feat(i18n): 게임 텍스트 번역 업데이트

lib/data/game_text_l10n.dart

@@ -26,10 +26,13 @@ bool get isJapaneseLocale => _currentLocale == 'ja';
 ///
 /// 예: "syntax error" → "Syntax Error"
 String _toTitleCase(String text) {
-  return text.split(' ').map((word) {
-    if (word.isEmpty) return word;
-    return word[0].toUpperCase() + word.substring(1).toLowerCase();
-  }).join(' ');
+  return text
+      .split(' ')
+      .map((word) {
+        if (word.isEmpty) return word;
+        return word[0].toUpperCase() + word.substring(1).toLowerCase();
+      })
+      .join(' ');
 }
 
 // ============================================================================
@@ -1941,3 +1944,55 @@ String get uiAboutDescription {
   if (isJapaneseLocale) return 'ASCIIアートとレトロ感のあるオフラインシングルプレイヤーRPGです。';
   return 'An offline single-player RPG with ASCII art and retro vibes.';
 }
+
+// ============================================================================
+// 공통 UI 액션 텍스트
+// ============================================================================
+
+String get uiConfirm {
+  if (isKoreanLocale) return '확인';
+  if (isJapaneseLocale) return '確認';
+  return 'Confirm';
+}
+
+String get uiCancel {
+  if (isKoreanLocale) return '취소';
+  if (isJapaneseLocale) return 'キャンセル';
+  return 'Cancel';
+}
+
+String get uiDelete {
+  if (isKoreanLocale) return '삭제';
+  if (isJapaneseLocale) return '削除';
+  return 'Delete';
+}
+
+String get uiConfirmDelete {
+  if (isKoreanLocale) return '정말로 삭제하시겠습니까?';
+  if (isJapaneseLocale) return '本当に削除しますか？';
+  return 'Are you sure you want to delete?';
+}
+
+String get uiDeleted {
+  if (isKoreanLocale) return '삭제되었습니다';
+  if (isJapaneseLocale) return '削除されました';
+  return 'Deleted';
+}
+
+String get uiError {
+  if (isKoreanLocale) return '오류가 발생했습니다';
+  if (isJapaneseLocale) return 'エラーが発生しました';
+  return 'An error occurred';
+}
+
+String get uiSaved {
+  if (isKoreanLocale) return '저장됨';
+  if (isJapaneseLocale) return '保存しました';
+  return 'Saved';
+}
+
+String get uiSaveBattleLog {
+  if (isKoreanLocale) return '배틀로그 저장';
+  if (isJapaneseLocale) return 'バトルログ保存';
+  return 'Save Battle Log';
+}