Enhance Existing App & Convert to PWA -- 2

I'm seeking a developer to add some functionalities to my existing Dart app and transform it into a Progressive Web App (PWA) using a basic library. Key Requirements: - Implement a few changes to triggers, specifically on data submission. - Add a language selector to the app. - Modify the app's data submission flow and add a confirmation step. Ideal Skills: - Proficiency in Dart and PWA development. - Experience in implementing user interface elements, such as a language selector. - Ability to modify app triggers and data submission processes.