fix: mutualise toolbar and menu titles

src/app/app-routing.module.ts

src/app/app.component.html

src/app/app.helper.ts

...ponents/presentationals/avatar/avatar.presentational.html

...s/language-selector/language-selector.presentational.html

...ract-main-toolbar/abstract-main-toolbar.presentational.ts

...ontal/main-toolbar-desktop-horizontal.presentational.html

...ertical/main-toolbar-desktop-vertical.presentational.html

...in-toolbar-mobile/main-toolbar-mobile.presentational.html

...tionals/theme-selector/theme-selector.presentational.html

.../components/routables/admin-home/admin-home.routable.html

...in/components/routables/admin-home/admin-home.routable.ts

.../components/routables/order-home/order-home.routable.html

...ervation-space-home/preservation-space-home.routable.html

...eservation-space-home/preservation-space-home.routable.ts

...utables/preservation-home/preservation-home.routable.html

src/assets/i18n/de.json

src/assets/i18n/en.json

src/assets/i18n/fr.json