Redirect /changeset/ID to /changesets/ID

[tordans]

My usecase is: I am on https://www.openstreetmap.org/changeset/90462261 and want to see the osmcha-view of this, so I change the domain-name form "openstreetmap" to "osmcha". This would be the fastest way to achieve this – its just one double click on the name and typing the new name.

However, since for some reason OSM uses singular routes, this results in a 404 – which is what lead me to https://github.com/mapbox/osmcha-frontend/issues/471

Ideally, OSMCha would just redirect the singular URL to the plural URL.