Finish explorationOnGoing

src/assets/icons/visu/exploration/validMark.svg

src/components/Challenge/ChallengeCardOnGoing.tsx

src/components/Exploration/ExplorationOngoing.tsx

src/components/Exploration/ExplorationView.tsx

src/components/Exploration/explorationOngoing.scss

src/db/explorationEntity.json

src/locales/fr.json

src/services/exploration.service.ts