Yes, Comm100 Live Chat fully supports Arabic/Hebrew on visitor side. You just need to modify the language to enter your interface text in Arabic/Hebrew.
Step by Step Instructions
1. Log into your Comm100 account.
2. Go to Campaign then Language.
3. Choose Customize the language on the visitor side windows under Advanced.
4. Then you can translate the visitor side interface language to Arabic/Hebrew manually in Current Text column.
5. Click Save Changes.