Due to the NGINX rewrite appending a "/" on URLs, the post-login
URIs are also given a trailing slash in. This made them invalid.
Now, clients generated with the init-db command are given
post-logout-redirects for both with and without a trailing slash.
Thus redirect after login works correctly now, and doesn't
bring you to steering-login (but to dashboard).

Fixes meta#94

- `Category`,
- `FundingCategory`,
- `Language`,
- `MusicFocus`,
- `Topic`,
- `Type`

- `Category`,
- `FundingCategory`,
- `MusicFocus`

Feat: Generate visual data model

See merge request !23

refactor schedule REST API

Closes #101

See merge request !22

The conflict responses should be send with an HTTP 409 status code as
they’re defined in our documentation. This was not the case as the
dashboard couldn’t handle these error codes, but is now fixed in
dashboard@4a07ad9e.