Add ability for the end user to switch to any language by translating all by its own for example with uploading some xml file with "usa text/user translation". Dont waste time for translation and qa. Just give ability to download in what way this file should be provided and give ability to upload it somewhere in settings section. After uploading just apply it in the app. It will expand using the app with many other languages at once and close the topic with multy language transltion.