FIX #12070 TIME 0:15 change css notification service

src/frontend/app/indexation/indexation.component.ts

src/frontend/app/notification.service.html

src/frontend/app/notification.service.scss

src/frontend/app/notification.service.ts

src/frontend/lang/lang-en.ts

src/frontend/lang/lang-fr.ts

src/frontend/lang/lang-nl.ts