Kata is a simple language learning app. You can create decks of flashcards, and test yourself on those cards.
A good piece of advice for learning a language with a different alphabet is to learn that alphabet as quickly as possible. An often forgotten aspect of learning a language, is that you may need to learn a new keyboard layout too.
Unlike other flashcard apps, Kata makes you type your answers with that languages keyboard. Kata helps you learn flashcards, and at the same time familiarise yourself with how to write in that language on a device.
Note: make sure you have installed your desired languages keyboard on your device. Go to Settings > General > Keyboard > Add a Keyboard... to add it.