Hi, There are two ways to do translation.
1. You need to get their app project code, add new language translations in it, and repackage it, which is obviously impossible.
2. If their app is expandable, you can add your Caption in table extension or page extension, and then translate the Caption you added in your App. This is possible, but it is also very troublesome.
More details:
https://yzhums.com/21067/
Hope this helps.
Thanks.
ZHU