In some cases of misconfiguration of the assets used by the amin interafce assets, such as the icons sprites file missing, or possibly the `webpack encore` command having failed or not been run, the Admin interface is, in parts at least, unuseable.

It would be nice if it was still useable, even if not looking nice.

Example (see screenshot): the buttons that allow editing a content are still useable. The buttons that allow adding a translation are not, because they are invisible