In order to find localizable strings that are no longer used in your Xcode project, you can run the following script:
./zombie_strings.sh path/to/the/project/root/folder
Or simply the following if you are already in the project's root folder:
./zombie_strings.sh
This script will recursively iterate over all the .strings files, checking if each of the localizable strings inside it are ever used in any source file in the project.
./zombie_strings.sh ~/project
🔎 Inspecting: ~/project/Resources/Localizable.strings
⚠️ "No_longer_used_string" is not used 💀