[ENHANCEMENT]  dont couple tagmanager to api/media

__Tasks:__

- [ ] gather feedback for my changes
- [ ] submit changes to the documentation

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Enhancement?  | yes #74
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none
Please don't use the FQN, just `UserInterface` should be sufficient. Same for the two exceptions in the next line.