There are a few apps that will translate your shop to RTL, using language settings.
We'd recommend checking out the following apps:
​Bablic​
​Langify​
​Panda Language Translate​
Alternatively, you have the option of editing your Liquid code which can apply this change:
If you're not completely confident with making these changes yourself, we would then definitely recommend approaching a specialist in custom coding.
We have a number of trusted specialists, all of which are grouped for your convenience under our help guide: