Thanks to Jelena we now have a Croatian translation for Startup Manager. It can be downloaded at the following location: http://downloads.sourceforge.net/st-m/StM_Croatian-1.0.exe
Note that because this translation was released after Startup Manager 2.4.1, it is not included in the Startup Manager installer. But you can download and install it separately by clicking the previously mentioned download link or by navigating to the translations package yourself and selecting the Croatian installer.
The translations package for Startup Manager 2.4.1 can be found over here: https://sourceforge.net/project/showfiles.php?group_id=137182&package_id=226099&release_id=601625
To all Croatian people and other people who want to use this new translation: Enjoy!