If I understand correctly, you want to create your own Joomla language pack for Pashto, because this language is not available as a Translation pack.
You'll find a complete guide on how to create a Joomla core language pack here. If you only need to translate the Front end, you might want to skip to the instructions for Site only pack.
If you don't want to create everything from scratch, you can also download an existing translation from a language similar to Pashto (you know better than me what language that would be, if any). Then extract all the files, and change the translations. Also make sure you edit all
.php files included. The tutorial I mentioned earlier explains what the different
.php files do.
Also remember to name your files correctly with the corresponding language tag. Joomla uses the ISO system to create language tags using:
- the languagecode
- the countrycode
I believe the correct language tag for Pastho would be