Checkpoint WebGL book renderer work

public/locales/en_US.json

@@ -29,6 +29,12 @@
   "options.voice": "Voice",
   "options.speed": "Speed",
   "options.audio": "Audio",
+  "options.bookDisplay": "Book Display",
+  "options.displayMode": "Display Mode",
+  "options.displayMode3d": "3D",
+  "options.displayMode2d": "2D",
+  "options.bookSize": "Book Size",
+  "options.bookProgress": "Page Stack",
   "options.volume": "Volume",
   "options.masterVolume": "Master Volume",
   "options.speechVolume": "Speech Volume",
@@ -53,6 +59,17 @@
   "options.apiUrl": "API URL",
   "options.model": "Model",
   "options.requestTimeoutMs": "Request timeout (ms)",
+  "webgl.title": "Procedural Book",
+  "webgl.sceneLabel": "3D book scene",
+  "webgl.bookControls": "Book controls",
+  "webgl.status3d": "3D scene",
+  "webgl.status2d": "2D scene",
+  "webgl.bookSize": "Pages",
+  "webgl.pageStackProgress": "Progress",
+  "webgl.fastBackward": "Fast backward",
+  "webgl.backward": "Backward",
+  "webgl.forward": "Forward",
+  "webgl.fastForward": "Fast forward",
   "credits.button": "credits",
   "credits.buttonTitle": "Show credits and third-party licenses",
   "credits.title": "Credits and Licenses",