MongoDB 3.4 introduces language-specific views that allow developers to create multiple views optimized for different languages, each with its own collated index and partial filter expression. These views enable read-only access to sensitive data while adhering to specific language rules. Additionally, user-defined roles can be created to restrict users' access to these views, ensuring they only see the data they're entitled to. The MongoDB Compass GUI allows for easy exploration and management of views, making it easier to understand and navigate complex data sets.