Add changelog page

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

src/app/core/services/app-config.service.ts

...rialisation/components/changelog/changelog.component.html

...rialisation/components/changelog/changelog.component.scss

...torialisation/components/changelog/changelog.component.ts

src/app/editorialisation/components/index.ts

src/app/editorialisation/editorialisation-routing.module.ts

src/app/editorialisation/models/changelog.model.ts

src/app/editorialisation/models/index.ts

src/app/editorialisation/services/changelog.service.ts

...ditorialisation/services/editorialisation.service.spec.ts

src/app/editorialisation/services/index.ts

src/app/routes.ts

src/assets/config/config.json

src/i18n/messages.en.xlf

src/i18n/messages.fr.xlf

src/i18n/traductions.fr.ts

src/i18n/traductions.ts