We started with version 4.8.0 of DNN and during the setup of our site we have customised a large number of the resource files. We have made changes to the email messages, warning messages etc etc so that they are more specific to our site and have done this through >Admin>Languages>Language Editor.We would like to now upgrade to version 4.8.01 but do not want to loose all our changes that we have made to these files. How do we retain these changes during an upgrade?