You will need a free software to translate the theme’s all English text in your language. The software name is Poedit. The Poedit is a common program which you can use to translate the theme. It’s available for free on poedit.net.
After you have installed Poedit, you can open it and select File > Open. Then select the pantograph.pot file from the theme you wish to translate which you can find in the /languages/ folder of PantoGraph theme.
Then go through every line of text and translate it to your native language. Afterwards you can save as the catalog with your language code (for example pantograph-es_ES.po for Spanish language) File > Save as . Poedit automatically creates the .mo file and saves it, too.
After that you have to do is to upload your created language files to /languages folder of PantoGraph theme and also upload those language files to wp-content/languages/themes folder using FTP or Cpanel.
The last step is to edit your WordPress wp-config.php file. Open that file and search for ‘define (‘WPLANG’, ”);‘ and edit that like this define (‘WPLANG’, ‘es_ES‘); (here es_ES is for Spanish, you need to change it if your language is different)That’s it.
To know more with Screenshots, please read this article.