added id to indexpage

__Tasks:__

- [x] add id to indexpage
- [x] remove localization from content/hompage link in navigation
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none