Hello Friend,
I am the #1 Opencart developer over freelancer.com, you can check my reviews/portfolio for my experience. I will change your all your words to Arabic language, I can help to make your website a perfect Arabic site.
Award project and create milestone. I also need your help in that.
Also my suggestion that when your site working with Arabic language then its needs Opencart as RTL, let me know your thoughts.
Kind Regards,
Pankaj Modi