FEAT #10762 TIME 0:20 add confidentiality watermark

src/frontend/app/home/home.component.html

src/frontend/app/home/home.component.scss

src/frontend/app/list/basket-list.component.html

src/frontend/app/list/basket-list.component.scss

src/frontend/lang/lang-en.ts

src/frontend/lang/lang-fr.ts

src/frontend/lang/lang-nl.ts