Move offliners definitions (or at least flags descriptions) to a data-driven source

[benoit74]

• Location: API

Situation

Currently, the offliners definitions are placed in the source code, including the description displayed for every offliners flags.

This makes their edition pretty complex (code change, code review, deployment) even if all this is as automated as possible.

It is particularly true for flag description which should be able to be updated "fast".

We (content team) wonder if we should move this to somewhere else (a file somewhere, or a DB table with UI screens and special user role, ...).

Let's discuss about this.