Listeo theme is translation ready. We that assume your WordPress is already in your language. If not, go to Dashboard → Settings → General and change the Site language.
You have to translate Listeo Theme and Listeo Core Plugin
Click New language, select your language and click Start Translating.
Now you should see that screen where you can translate each string that is used in theme:
When you’re done, click Save, and it’s also recommended to click both “Po” and “Mo” buttons to save them on your PC as a backup.