If you want to translate the website into your language, we recommend you to use Loco Translate which can be officially downloaded at https://wordpress.org/plugins/loco-translate/ as well as to get official support.
In case, if you do not want to use any plugin, the theme comes with the translation files:
Step 1 – please download this software and install it http://www.poedit.net/download.php
Step 2 – please open .pot or .po file using poedit tool and translate the existing text to your own
Step 3 – when you save the file, you must name it according to your language
Step 4 – upload the file to the required folder on your server, that’s all