Importing translated content
From UPK wiki
If you have previously exported content for translation, you can use this procedure to import the translated content back into UPK.
- Select menu option Tools | Import | Localization.
- In the Import for Localization dialog box, click on the Browse button, and navigate to the file containing the translated content (.doc or .xlf).
- Click on OK.
If the content object that has been translated is currently checked in, it will be checked out to you.