Add translation for uploading 3D images

backend/en/resource.json

@@ -52,6 +52,8 @@
         "delete_question": "You are about to delete an object resource!",
         "delete_no": "No, it was an accident (go back)",
         "delete_yes": "Yes, take it away",
-        "preview": "Preview"
+        "preview": "Preview",
+        "3d_object": "3D Object",
+        "upload_3d_object": "Upload 3D object"
     }
 }