chore: keep "World Heritage" untranslated in ja appTitle

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: zigzagdev

client/src/locals/ja/ui.json

@@ -23,7 +23,7 @@
   "longitude": "経度",
   "yes": "はい",
   "no": "いいえ",
-  "appTitle": "世界遺産",
+  "appTitle": "World Heritage",
   "appTagline": "検索・比較で世界遺産を学ぶ。",
   "all": "すべて",
   "keyword": "キーワード",