feat: i18n StoryGallery UI labels and data layer chapter/ending names

public/demo/locales/en.json

@@ -60,5 +60,15 @@
       "continue": "Keep moving forward",
       "back": "Turn back"
     }
+  },
+  "chapter": {
+    "ch1": "Chapter 1: Awakening",
+    "ch2": "Chapter 2: Investigation",
+    "ch3": "Chapter 3: Finale"
+  },
+  "ending": {
+    "trust_end": "Trusted Ally",
+    "alone_end": "Lone Path",
+    "continue_end": "Keep Moving Forward"
   }
 }

public/demo/locales/ja.json

@@ -55,5 +55,15 @@
       "continue": "先へ進む",
       "back": "引き返す"
     }
+  },
+  "chapter": {
+    "ch1": "第一章：目覚め",
+    "ch2": "第二章：捜査",
+    "ch3": "第三章：終局"
+  },
+  "ending": {
+    "trust_end": "信頼の仲間",
+    "alone_end": "孤独の道",
+    "continue_end": "前進を続ける"
   }
 }

public/demo/locales/zh.json

@@ -60,5 +60,15 @@
       "continue": "继续前进",
       "back": "回头"
     }
+  },
+  "chapter": {
+    "ch1": "第一章：醒来",
+    "ch2": "第二章：调查",
+    "ch3": "第三章：终局"
+  },
+  "ending": {
+    "trust_end": "信任的伙伴",
+    "alone_end": "独行之路",
+    "continue_end": "继续前行"
   }
 }