We’ve removed some bundled translations in favour of WordPress Translate ones – your WordPress should automatically download the latest versions from the online repository (double-check your dashboard Updates section for available translations).
The ‘More Posts’ text is now part of the theme settings (look under the Presentation Page section).
Available translations will show up at the end of WordPress’ Updates section (if they weren’t already installed at a previous maintenance cycle) – when your WordPress is configured to that particular language.