In the (very rare) case when users change their native language, only the newly added bookmarks are added in the new language. This can lead to multiple languages being tested in the same exercise session, which is quite confusing for the learner, especially when the languages are closely related.
To avoid updating all bookmarks, every time a user changes the language, a suggestion could be to only schedule words in the same language pair in one exercise session or add an option "Your native language has changed. Do you want to update this translation?" when doing exercises.
In the (very rare) case when users change their native language, only the newly added bookmarks are added in the new language. This can lead to multiple languages being tested in the same exercise session, which is quite confusing for the learner, especially when the languages are closely related.
To avoid updating all bookmarks, every time a user changes the language, a suggestion could be to only schedule words in the same language pair in one exercise session or add an option "Your native language has changed. Do you want to update this translation?" when doing exercises.