OZG-7774 improve code quality

...min/configuration-shared/src/lib/configuration.linkrel.ts

...tion/src/lib/menu-container/menu-container.component.html

...n/src/lib/menu-container/menu-container.component.spec.ts

...ration/src/lib/menu-container/menu-container.component.ts

...iguration/src/lib/menu-container/menu/menu.component.html

...ration/src/lib/menu-container/menu/menu.component.spec.ts

...nfiguration/src/lib/menu-container/menu/menu.component.ts

...ntainer/menu/statistik-menu/statistik-menu.component.html

...iner/menu/statistik-menu/statistik-menu.component.spec.ts

...container/menu/statistik-menu/statistik-menu.component.ts

...system/src/lib/navbar/nav-item/nav-item.component.spec.ts