Resolve "Studies frontend for creation and edition"

...versions/c4ff1cfa66b7_study_data_divided_in_more_field.py

backend/app/models/studies.py

backend/app/schemas/studies.py

frontend/src/lang/en.json

frontend/src/lang/fr.json

frontend/src/lib/api/studies.ts

frontend/src/lib/components/studies/StudyForm.svelte

frontend/src/lib/types/study.ts

frontend/src/routes/admin/studies/new/+page.server.ts