[Dave the Minion]

Not sure it's needed in this script as edit title & sort title are available from within kodi.
Context menu>Manage>edit sort title.

All kodi's local strings should be in a addon package located in the kodi install dir /addons/resource.language.en_gb /resources/strings.po (default lang pack).
Sort title is '171'.

Thank you for your response. I know that sort title is available through the context menu but all these other options are not. My goal is to have 1 button in the video information screen to be able to edit all this information, which this add-on will do, save for the sort title.

Unfortunately my theory did not work in reality. I added the extra line to the default.py file with the string you've noted and it produced an error with the script. The error continues if I delete the line and re-save the file as well. I have to copy in a fresh version of the original file and restart Kodi to get the script to work properly again, without the sorttitle option of course.