Selecting multiple files in the left / navigation panel and then adding localization through the panel on the right / utility should work, but it is not. I filed error # 9276560 on Xcode 4.0.1.
If you need to support many languages, this can help:
- Click on the file #n
- Add localization
- Repeat steps 1 and 2 for all files
- Click on the project in the left / navigation section
- In the project details pane, add localization
What this means is, add each previously localized file to a new language (s). You still have to add 50 files separately, but at least you will not need to perform 50 operations compared to the number of languages. In my case, it saved me several hundred steps.
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