iXLIFF

This app allows easy opening and editing of XLIFF files.

If you are a translator, this app is the easiest way to edit the XLIFF files without having to make sure the file structure stays intact.

If you are a developer you can use "NSLocalizedStrings" in your code and the "Xcode Export Localization" command to easily generate XLIFF files to translate yourself or to send to a translator.