The language packs for SLK 1.7 onwards.
Most will be missing translations for any new strings added since 1.3.1.
Let me know if there's any problems.
Download the language packs and unzip onto your SharePoint server.
Open a PowerShell command prompt and navigate into the folder for your language.
Run InstallSolution.ps1. This should add the localized package and deploy it.
There's a few more details at http://blog.salamandersoft.co.uk/index.php/2015/03/sharepoint-learning-kit-language-packs/