Add unknown property for construction year + add hints in form

src/components/ProfileType/ProfileTypeFormMultiChoice.tsx

...components/ProfileType/ProfileTypeFormNumberSelection.tsx

src/components/ProfileType/profileTypeForm.scss

src/constants/consumptionConstants/electricSpecific.json

src/constants/consumptionConstants/heating.json

src/enum/profileType.enum.ts

src/locales/fr.json