archive: implement unarchive

made a separate route instead of reusing install route. this was
because we want to copy over all the old app config as much as
possible.

dashboard/public/translation/en.json

@@ -659,6 +659,11 @@
         },
         "deleteArchive": {
             "deleteAction": "Delete"
+        },
+        "restoreArchiveDialog": {
+            "title": "Restore from Archive",
+            "description": "This will install {{appId}} at the specified location with backup from {{creationTime}}.",
+            "restoreAction": "Restore {{ dnsOverwrite ? 'and overwrite DNS' : '' }}"
         }
     },
     "branding": {