refactoring setHeader

src/frontend/app/about-us.component.ts

.../administration/action/action-administration.component.ts

...administration/action/actions-administration.component.ts

src/frontend/app/administration/administration.component.ts

.../administration/basket/basket-administration.component.ts

...administration/basket/baskets-administration.component.ts

...tion/contact/contacts-filling-administration.component.ts

...ration/contact/contacts-group-administration.component.ts

...ation/contact/contacts-groups-administration.component.ts

...diffusionModel/diffusionModel-administration.component.ts

...iffusionModel/diffusionModels-administration.component.ts

...istration/docserver/docserver-administration.component.ts

...stration/docserver/docservers-administration.component.ts

...ministration/doctype/doctypes-administration.component.ts

...dministration/entity/entities-administration.component.ts

...pp/administration/group/group-administration.component.ts

...p/administration/group/groups-administration.component.ts

...dministration/history/history-administration.component.ts

...ion/notification/notification-administration.component.ts

...on/notification/notifications-administration.component.ts