Add timeline to menu.

src/localize/languages/en.json

@@ -42,7 +42,8 @@
         "snapshot": "Most recent snapshot",
         "snapshots": "Snapshots gallery",
         "image": "Static image",
-        "current": "Current view"
+        "current": "Current view",
+        "timeline": "Timeline view"
       },
       "timeout_seconds": "Reset to default view X seconds after user action (0=never)",
       "update_cycle_camera": "Cycle through cameras when default view updates",