Sinhalese educating interpretation

We have build an app in Sinhalese that we are currently scaling to other countries in Singapore. We have translated all the app content as well as our customers coms in English and are now looking to translate everything in Sinhalese, Malay and Tamil.

We are looking for a one off translation of all of our content (doc attached) and, if the fit is right on each side, we would also require ongoing assistance to translate changes as we go.