Add the source file (only the file, not the .lproj folder), then make it localizable, add all the languages โโyou want, xcode will create the .lproj folders and duplicate the source file for each language.
After you can overwrite each file duplicated by your already translated file (or a file if it has the same name or content).
Remember to set the source file format to UTF-16 when you add it.
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