In practice these always existed in a 1-to-1 relation. Having to support
other combinations brings extra overhead we do not want anymore.
This still includes the monkey-patched url overwrites, the middleware
etc (though ported to organisation) to preserve all current behaviour.
In a subsequent follow-ups we can clean this up step by step.
https://github.com/liqd/a4-product/pull/822
taiga 2136