For the More Curious: Localizing XIB files without Base Internationalization
Before Xcode had the Base internationalization feature, the localizable strings option was not available. Instead, you would maintain a XIB file for every locale that you wanted to support. So, you would have an en.lproj/BNRDetailViewController.xib and an es.lproj/BNRDetailViewController.xib. As you can imagine, maintaining every XIB in every language you wanted to support was a hassle.
To help with the creation and maintenance of localized XIB files, you could use a command-line tool named ibtool to suck the strings from your native language XIB file into a strings file. Then, you would translate these strings and create a new XIB file for each language. ...
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