If you want a Multi-language website then we recommend WPML plugin.
If you only need to translate the theme to one language then the easiest way to translate the theme is to use Poedit and to create a po file of your language.
You can find the .po file in the lang folder.
Download the poedit program ( https://poedit.net/ ) and create a new translation, open the cesis.pot or thefox.pot file which is in our theme lang folder.
Then select the language you want to use and start to translate, When you are done translating save the file in the lang folder and upload it to your server.
http://wplang.org/translate-theme-plugin/ ( check the "2. How to translate a WordPress theme (or plugin)" Section )