The test that matters
Not whether the Arabic is grammatically correct. Whether an Arabic-speaking receptionist, under pressure, reaches for the software rather than the notebook. That is a much harder standard, and it is the only one that predicts whether the data will be any good six months later.
What "designed bilingually" means in practice
It means I reviewed the layout of every screen twice, in both directions, before building it — not that I added a translation file at the end. The second direction is where you discover that your form flows left to right for reasons nobody wrote down.