ts: Changelog history for fields, More spinners

src/api/Backend.tsx

src/api/DummyBackend.tsx

src/api/UserData.tsx

src/api/api_v1_types.d.ts

src/components/CourseListing.tsx

src/components/DefaultLayout.tsx

src/components/ModeratorBarrier.tsx

src/components/OMConfigComponent.tsx

src/components/Player.tsx

src/pages/index.tsx

src/pages/internal/changelog.tsx