KBabel is well-integrated into the KDE desktop. Konqueror is the combined file manager and web browser of the KDE desktop. In this screen shot, Konqueror is being used to browse the contents of a directory containing PO files. KBabel's summary statistics regarding the translation status of each PO file are being displayed on-the-fly in this preview mode. In each pie chart, green indicates translated messages, red untranslated, and blue “fuzzy”.
While many people just use Yudit or some other editor to create PO translation files, I think you can see that KBabel provides a set of convenience and management features which can streamline the tedious process of localizing software, especially in large software projects like KDE.