You can translate themes to any language. The easiest way to translate a theme is via a Translation WordPress Plugin. Check out wordpress.org for a list of translation plugins.
Our current recommendation for translating is the plugin Loco Translate
Just install Loco Translate and then you can translate your theme under “Loco Translate“. Here is a video that shows you how to use Loco Translate:
Here are some of the Multilingual WordPress Plugins that will allow you to add multiple languages: