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Official Description

Xliff Editor provides the easiest way of editing your XLIFF files. No more messing around with the XML format, worrying about file corruption.

*Whats an XLIFF file?
XLIFF files are based on the standard XML format, and are used specifically to exchange localisation data.

*Why XLIFF?
Xcode 6 introduced the ability to export/import all your localisation data, taking away the need for sending various file formats to your localisers for translating. The XLIFF format makes translating your apps a cinch, as it removes all the layout and formatting, and just provides a simple text to text translation mechanism for your translators.

*Xliff Editor Features
-File duplication
-Editing of Target Language
-Highlighted search
-Easy recognition of un-translated strings
-XLIFF, XLF file support

**Currently only XLIFF v1.2 files are supported.