feat: i18n achievement UI labels and data layer title/description

src/locales/en.json

@@ -24,6 +24,7 @@
     "quitToMenu": "Back to Menu",
     "pauseHint": "Esc = Resume",
     "achievements": "Achievements",
+    "achievementUnlocked": "Achievement Unlocked",
     "gallery": "Gallery",
     "story": "Story Progress",
     "startChapter": "Start",

src/locales/ja.json

@@ -24,6 +24,7 @@
     "quitToMenu": "メニューに戻る",
     "pauseHint": "Esc = 再開",
     "achievements": "実績",
+    "achievementUnlocked": "実績解除",
     "gallery": "ギャラリー",
     "story": "ストーリー進行",
     "startChapter": "開始",

src/locales/zh.json

@@ -24,6 +24,7 @@
     "quitToMenu": "返回主菜单",
     "pauseHint": "Esc = 继续",
     "achievements": "成就",
+    "achievementUnlocked": "成就解锁",
     "gallery": "画廊",
     "story": "故事进度",
     "startChapter": "开始",