Add Db dumps translation

translations/en-us.all.json

@@ -750,5 +750,9 @@
   {
     "id": "last_scraped",
     "translation": "Last scraped: "
+  },
+  {
+    "id": "no_database_dumps_available",
+    "translation": "No database dumps are available at this moment."
   }
 ]

translations/pt-br.all.json

@@ -690,5 +690,5 @@
   {
     "id": "cancel",
     "translation": "Cancelar"
-  }
-]
+  }
+]