Nextcloud, Collabora and 404s

Running your own docker based Collabora Online server? Getting 404s after an update with these log entries:

https://.../browser/.../cool.html?WOPISrc=...

Seems like some URLs where changed:

Seems like /loleaflet has been renamed to /browser and lool to cool in latest collabora version.

See #1904 and Proxy Settings.