- added function to create an exercise test with asset

i18n/en.ts

i18n/i18nRoot.ts

src/communicationLayer/exerciseEditorLayer.ts

src/components/sites/exerciseEditorSite/headerBarContent.tsx

src/constants.ts

src/helpers/assetHelper.ts

src/helpers/jsonTransformer.ts

src/types/exerciseEditor.ts

src/types/exercisePreview.ts

src/types/submissions.ts