Adding common names and translations as you proposed sounds like a great place to start in terms of making iNaturalist more accessible to your local users.
iNat’s translations are done via CrowdIn which anyone can contribute to (see here: https://www.inaturalist.org/pages/translate)
Adding common names in local languages is also pretty straightforward and info is here: https://forum.inaturalist.org/t/how-to-add-a-common-name-to-a-taxon/9792