Add style + translation + links + Error handling

...p/core/components/main/side-menu/side-menu.component.html

src/app/core/components/sign-up/sign-up.component.html

src/app/editorialisation/components/home/home.component.html

.../user/components/user-account/user-account.component.html

.../user/components/user-account/user-account.component.scss

...pp/user/components/user-account/user-account.component.ts

src/i18n/messages.en.xlf

src/i18n/messages.fr.xlf

src/i18n/notification-messages/notification-messages.fr.ts

src/i18n/notification-messages/notification-messages.ts