We only offer English as the default language of our plugins, however, we do provide the ability to translate them to any other language by using the included .pot language files.
Sometimes our clients share the translation they make for their own site. We can't include those into the official plugin package, as we can't fully support those translations or make sure they are updated on time. So we decided to just publish them here, offering them "as is" - if you'd like to use any of the listed translations, feel free to download and test it on your site.
Also, if you'd like your own translation to be listed here, feel free to email us at firstname.lastname@example.org.