NAT-315: Restore ISIS should be optional in migrate iptrunk

gso/translations/en-GB.json

@@ -31,7 +31,8 @@
             "iptrunk_sideB_ae_members_descriptions": "Aggregated Ethernet member interface descriptions",
             "migrate_to_different_site": "Migrating to a different Site",
             "remove_configuration": "Remove configuration from the router",
-            "clean_up_ipam": "Clean up related entries in IPAM"
+            "clean_up_ipam": "Clean up related entries in IPAM",
+            "restore_isis_metric": "Restore ISIS metric to original value"
         }
     },
     "workflow": {