What is the second parameter of NSLocalizedString()?

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The second parameter is a comment that will automatically appear in the strings file if you use the genstrings command-line utility, which can create the strings file for you by scanning your source code.

The comment is useful for your localizers. For example:

NSLocalizedString(@"Save",@"Title of the Save button in the theme saving dialog");

When you run genstrings, this will produce an entry in the Localizable.strings file like this:

/* Title of the Save button in the theme saving dialog */
"Save" = "Save";

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