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* Previously, we used `Locale.getISOLanguages()` to display the language list. However, this did not include all the languages in which books are available. Now, we use the `OPDS` stream via libkiwix to fetch online books, and utilize a method in libkiwix that provides the list of available book languages. This dynamically retrieved list is now shown in the `LanguageFragment`, allowing users to select a language and download books accordingly. * The `LanguageFragment` previously relied on `ObjectBox` for storing and managing selected languages. This has now been migrated to use `Room` database instead. * A migration strategy has been added to move previously selected languages from ObjectBox to Room. * Corresponding test cases for migration have been added, and existing tests have been refactored to reflect these changes. * Since we now rely on `libkiwix` to retrieve the language list, the `ZimManageViewModelTest` initially failed due to native code dependencies (JNI) not loading in unit test environments. To address this, we refactored the code and introduced a `JNIModule` class in the app module (where `OnlineLibraryManager` resides). We now inject the `Library` object, allowing us to pass a mocked instance to `ZimManageViewModel` for proper unit testing.