Synchronize paths for all existing content

In the module's configuration settings, there's a "Refresh all paths now?" checkbox, but there is no implementing code associated with it.

This ticket will be used to manage that implementation.

As for how it will work, it probably makes sense to synchronize all translations from the entity instance's language (If it has a path set). If it doesn't have a path set, synchronize from the first translation that does have a path set. If we do something like this, we'd need to very clearly explain that configuration data could be lost.