We use Transifex to manage translations for J2Store. Check the project at https://opentranslators.transifex.com/projects/p/j2store2/
and download your language.
You can also contribute translations using Transifex. Its easy.
The J2Store community has translated the J2Store into various languages. The translations are contributed by our valuable users. This is the language file for J2Store v1.2.1.
NOTE: Before you use these files, check the translation and make necessary changes to suit your needs.
Want to translate J2Store in your language? Check this tutorial