Bring the web documentation in line with develop in every language

- English pages describe backups, the manifest, ROCm GPUs, OCI host directories and storage as develop does, and say user instead of operator
- New paragraph on host directories mounted with everything the host has mounted inside them, and a new update rule for host directories
- The Proxmox Backup Server section of the post-install page is translated into every language
- Spanish and the other six languages follow the updated English

web/messages/en/docs/oci-manager/lifecycle.json

@@ -104,6 +104,7 @@
               "The new image is verified layer by layer before the CT stops. A download that arrives damaged is fetched a second time; an image already cached that fails the check is downloaded again.",
               "Settings changed in Proxmox VE after the installation (memory, swap, cores, CPU limit, CPU priority, start with the node) are kept and carried into the new contract.",
               "The LAN interface that the Arr suite and multi-container applications add (<code>net1</code>) and the start order (<code>startup</code>) are given back to the new container as they are.",
+              "A host directory is recognised by its path and by the filesystem it is on, not by the device name the host gives its disk, so a USB or network disk that comes back under another name is still the same directory. When its disk is not connected, the update stops before the CT is stopped and names the directory that is missing.",
               "Any other difference between the CT and its contract stops the update before the CT is stopped."
             ]
           }