Is there a way to search for all assets that have a reference to a certain LocalizedString in the editor?
Either with a tool or an editor script.
We don’t have an official tool for finding localized strings in a project, but I have created a script that can accomplish this task. You can find the script on this GitHub Gist link: Find localization entries that are not used · GitHub. Feel free to use it as is or use it as a guide for creating your own tool.