@ahosny am I correct in understanding that you’re undertaking the project of localizing Bahmni into Arabic? Can I break this out into a separate discussion topic?
Assuming that’s the case, we definitely would want to see this get incorporated into the main Bahmni product. So, when you do make changes to bahmniapps, please do this in a fork and send a pull request for it.
Translating the messages themselves should be done through the online Transifex tool, not directly in the codebase. See Translating Bahmni and Step 3 of Product Internationalization on the wiki.
But I expect you will also need to make some styling and layout changes in the html and css, so I expect these changes would happen in the code in https://github.com/Bahmni/openmrs-module-bahmniapps.