Software localization and linguistic and functional tests are extremely important for the success of an app or platform.
These ensure that all the details have been taken into consideration and there are no mistakes affecting your buttons, messages after clicks, etc. The final translation must respect the sociocultural context of your target market and have a clear and concise message that matches the original in its content and structure. The same happens with voice overs, if there are any: they need to be consistent with the original proposal and need to show the same intent, always taking into consideration the social context of your target users. Testing checks all these details.
If you want to internationalize your digital products, software localization and linguistic and functional tests ensure that your application will run perfectly in the target language.