Your apps need to be made adaptable to the local conditions. One of the important factors is the Language. You can add Languages that can be used to your app. To translate your app across different languages the following steps are to be followed:
Download the ‘English Master Language’ JSON file.
The downloaded JSON file has all the words and sentences used in your app as ‘keys’(do not change or modify these keys). Write down the translation of the key as its ‘value’ in your desired language, thus forming a ‘key value’ pair. Save the file once you are done.
Click on ‘Add Language’. Select a language and upload the corresponding translated JSON file. After you are done uploading all the translations click on ‘Save’.
The translation is available in preview as well as on the device the next time you publish your app.