Hatsune Miku: Project DIVA F 2nd features English sub-titles for songs in the rhythm game and AR Live/Live Studio mode! To enable English Lyrics, go to the "Other" Menu -> "Game Options" -> "Subtitle Options" and choose "English". If you want to sing along with the lyrics, just switch this option back to "Japanese Romaji".
* Please note that some songs do not include English translations.