Android Mobile App

Hi ! I want to do a mobile app for children, an Educational app. Purpose : Picture book with text + sounds, WITH TWO DIFFERENT LANGUAGES. INTERFACE : - very simple interface (aiming for children up to 4 years) - Similar to this app : [login to view URL] (with no buttons / no effects on pictures) - Or similar to "level 1" of this app : [login to view URL] - Or like this one : [login to view URL] - touching a flag will change the name of the picture and the pronunciation CATEGORIES : - animals - food, - vehicules - colours - alphabet - numbers (etc...) I want to start with only 2 caterogies (animals and vehicules) PICTURES and Sounds : I can give you some cliparts opensource / commercial use allowed it depends on the price for providing pictures and sounds SETTINGS : - Sound : 0, Soft, Normal - Music : 0, Soft, Normal - Speed : 1, 2, 3 - Langage 1 : , french, corsican, english (Add language / further add-on) - Langage 2 : french, corsican, english, - Autoplay : yes, No ADVANCED USER SETTINGS : - possibility to edit text and voice speech for every picture ( ex : cat / category animals / English) Initially the app will be free / no publicity This app must be easily multi platform ( Android, IOS) : HTML 5 or hybrid app. ? I am not sure about technology / code to use. I think it will be an "offline" use, with 2 defaults langages. Possibility to download others languages in the future... Next upgrades / add-ons : Others languages could be added easily (ex : celtic, breton, italian, etc...) Others categories and pictures could be added easily (by you or me with a control panel)