Improve english wording and translations

src/app/core/components/contact/contact.component.html

src/app/core/components/contact/contact.component.scss

...ore/components/cookie-banner/cookie-banner.component.html

...ore/components/cookie-banner/cookie-banner.component.scss

src/app/core/components/error/error.component.scss

src/app/core/components/feedback/feedback.component.scss

src/app/core/components/main/footer/footer.component.scss

src/app/core/components/main/header/header.component.scss

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

...e/components/dataset-detail/dataset-detail.component.html

...s/dataset-detail/dataset-info/dataset-info.component.html

src/app/geosource/services/dataset-research.service.ts

src/app/user/components/auth/login/login.component.html

src/app/user/components/auth/sign-up/sign-up.component.html

...pp/user/components/user-profil/user-profil.component.html

src/i18n/messages.en.xlf

src/i18n/messages.fr.xlf

src/i18n/traductions.fr.ts

src/i18n/traductions.ts