The two most popular platforms for mobile apps, Android and iOS, are examples of how modern operating systems are building in capabilities to help developers create language-independent apps. They both offer:

Internationalization built into the platform, letting end users choose their locale.

Development environments with functions to help developers extract user-facing text strings from the code and store them in separate files.

Auto layout functionality to automatically change screen layout to take account of differing text lengths in localized versions.

Functions (methods, classes) that developers can use in the app code to automatically format numbers, dates, and plurals according to the locale chosen by the user.

Apart from differences in the way localized information is stored by each operating system, Android and iOS offer a similar approach overall to content separation and formatting functions.