fix: restore the hosts import/export button label (#1767)

src/ui/locales/en.json

@@ -495,6 +495,7 @@
     "deleteSelected": "Delete",
     "exitSelection": "Exit selection",
     "collapseBtn": "Collapse",
+    "importExportBtn": "Import / Export",
     "hostStatusesRefreshed": "Host statuses refreshed",
     "failedToRefreshHosts": "Failed to refresh hosts",
     "movedHostTo": "Moved {{host}} to \"{{folder}}\"",