Sometimes there more than one similar files that you want to localized. The easiest way to do that is to add all such files to a directory and add the directory to the Sisulizer project. However it may be that your similar files are in several different directories and they can not be moved to a single directory. In that case you can add them into this list. All the files in this list are localized in the same way and on same settings as the main file.