Cantabile has long had the ability to use language files to change the language displayed in Cantabile's user-interface. Currently these files aren't included in the installation package however and need to be manually installed.
This video walk-through shows how to install and activate these files.
Download links for the language files are available here. If you're interested in maintain and contributing to a language file, please see here.
Again... thank you to all those who've contributed to these translations.