refactor(button): remove use of enum

...admin/components/manage-users/manage-users.component.html

...p/admin/components/manage-users/manage-users.component.ts

src/app/admin/components/nav-bar/nav-bar.component.html

src/app/admin/components/nav-bar/nav-bar.component.ts

src/app/annuaire/filter-modal/filter-modal.component.html

src/app/annuaire/filter-modal/filter-modal.component.ts

src/app/annuaire/result-list/result-list.component.html

src/app/annuaire/result-list/result-list.component.ts

src/app/carto/carto.component.html

src/app/carto/carto.component.ts

src/app/contact/contact.component.html

src/app/contact/contact.component.ts

src/app/form/footer-form/footer-form.component.html

src/app/form/footer-form/footer-form.component.ts

...mponents/information-step/information-step.component.html

...components/information-step/information-step.component.ts

...-structure-choice/profile-structure-choice.component.html

...le-structure-choice/profile-structure-choice.component.ts

.../structure-equipments/structure-equipments.component.html

...rm/structure-equipments/structure-equipments.component.ts