You do not have to, each application created in Tool4App is subsequently generated and published for both platforms. All you need to do is create it only once.
Tool4App does not limit you by predefined set of languages. You can simply add any language and it’s translations in the administration.
Tool4App’s capabilities are still being developed and expanded. Please contact us via the contact form. We will discuss your request and either add it to Tool4App or we will offer you a tailored modification just for you.