Merge pull request #1927 from ProjectMirador/1873-load-window-error

__tests__/fixtures/version-2/broken.json

__tests__/integration/mirador/invalid-api-response.test.js

__tests__/src/components/ManifestListItem.test.js

__tests__/src/components/ManifestListItemError.test.js

__tests__/src/reducers/manifests.test.js

locales/en/translation.json

src/components/ManifestListItem.js

src/components/ManifestListItemError.js

src/containers/ManifestListItemError.js

src/state/actions/manifest.js

src/state/reducers/manifests.js