Thank you for your feedback!
A great place to start is to read this tutorials. The main idea is to take sparkling.pot file from theme folder - languages and start translation via Poedit application or some other tool.
Since Persian is Right-to-Left (RTL) language there might be some incompatibility issues with this theme as Bootstrap doesn’t support it properly and it is promised that it will be updated sometime soon but I can’t give you an exact date on that. However, there shouldn’t be any major issues.
Once translation is done you can send translation .po and .mo files (.mo will be generated automatically by Poedit or other app) to me via email support[at]divilab.com (replace [at] with @). Afterwards I will add to our contributors page
Let me know if you have any questions regarding translation process.